simple-squiggle

decimal.js (135913B)

---

 ;(function (globalScope) {
   'use strict';
 
 
   /*
    *  decimal.js v10.3.1
    *  An arbitrary-precision Decimal type for JavaScript.
    *  https://github.com/MikeMcl/decimal.js
    *  Copyright (c) 2021 Michael Mclaughlin <M8ch88l@gmail.com>
    *  MIT Licence
    */
 
 
   // -----------------------------------  EDITABLE DEFAULTS  ------------------------------------ //
 
 
     // The maximum exponent magnitude.
     // The limit on the value of `toExpNeg`, `toExpPos`, `minE` and `maxE`.
   var EXP_LIMIT = 9e15,                      // 0 to 9e15
 
     // The limit on the value of `precision`, and on the value of the first argument to
     // `toDecimalPlaces`, `toExponential`, `toFixed`, `toPrecision` and `toSignificantDigits`.
     MAX_DIGITS = 1e9,                        // 0 to 1e9
 
     // Base conversion alphabet.
     NUMERALS = '0123456789abcdef',
 
     // The natural logarithm of 10 (1025 digits).
     LN10 = '2.3025850929940456840179914546843642076011014886287729760333279009675726096773524802359972050895982983419677840422862486334095254650828067566662873690987816894829072083255546808437998948262331985283935053089653777326288461633662222876982198867465436674744042432743651550489343149393914796194044002221051017141748003688084012647080685567743216228355220114804663715659121373450747856947683463616792101806445070648000277502684916746550586856935673420670581136429224554405758925724208241314695689016758940256776311356919292033376587141660230105703089634572075440370847469940168269282808481184289314848524948644871927809676271275775397027668605952496716674183485704422507197965004714951050492214776567636938662976979522110718264549734772662425709429322582798502585509785265383207606726317164309505995087807523710333101197857547331541421808427543863591778117054309827482385045648019095610299291824318237525357709750539565187697510374970888692180205189339507238539205144634197265287286965110862571492198849978748873771345686209167058',
 
     // Pi (1025 digits).
     PI = '3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632789',
 
 
     // The initial configuration properties of the Decimal constructor.
     DEFAULTS = {
 
       // These values must be integers within the stated ranges (inclusive).
       // Most of these values can be changed at run-time using the `Decimal.config` method.
 
       // The maximum number of significant digits of the result of a calculation or base conversion.
       // E.g. `Decimal.config({ precision: 20 });`
       precision: 20,                         // 1 to MAX_DIGITS
 
       // The rounding mode used when rounding to `precision`.
       //
       // ROUND_UP         0 Away from zero.
       // ROUND_DOWN       1 Towards zero.
       // ROUND_CEIL       2 Towards +Infinity.
       // ROUND_FLOOR      3 Towards -Infinity.
       // ROUND_HALF_UP    4 Towards nearest neighbour. If equidistant, up.
       // ROUND_HALF_DOWN  5 Towards nearest neighbour. If equidistant, down.
       // ROUND_HALF_EVEN  6 Towards nearest neighbour. If equidistant, towards even neighbour.
       // ROUND_HALF_CEIL  7 Towards nearest neighbour. If equidistant, towards +Infinity.
       // ROUND_HALF_FLOOR 8 Towards nearest neighbour. If equidistant, towards -Infinity.
       //
       // E.g.
       // `Decimal.rounding = 4;`
       // `Decimal.rounding = Decimal.ROUND_HALF_UP;`
       rounding: 4,                           // 0 to 8
 
       // The modulo mode used when calculating the modulus: a mod n.
       // The quotient (q = a / n) is calculated according to the corresponding rounding mode.
       // The remainder (r) is calculated as: r = a - n * q.
       //
       // UP         0 The remainder is positive if the dividend is negative, else is negative.
       // DOWN       1 The remainder has the same sign as the dividend (JavaScript %).
       // FLOOR      3 The remainder has the same sign as the divisor (Python %).
       // HALF_EVEN  6 The IEEE 754 remainder function.
       // EUCLID     9 Euclidian division. q = sign(n) * floor(a / abs(n)). Always positive.
       //
       // Truncated division (1), floored division (3), the IEEE 754 remainder (6), and Euclidian
       // division (9) are commonly used for the modulus operation. The other rounding modes can also
       // be used, but they may not give useful results.
       modulo: 1,                             // 0 to 9
 
       // The exponent value at and beneath which `toString` returns exponential notation.
       // JavaScript numbers: -7
       toExpNeg: -7,                          // 0 to -EXP_LIMIT
 
       // The exponent value at and above which `toString` returns exponential notation.
       // JavaScript numbers: 21
       toExpPos:  21,                         // 0 to EXP_LIMIT
 
       // The minimum exponent value, beneath which underflow to zero occurs.
       // JavaScript numbers: -324  (5e-324)
       minE: -EXP_LIMIT,                      // -1 to -EXP_LIMIT
 
       // The maximum exponent value, above which overflow to Infinity occurs.
       // JavaScript numbers: 308  (1.7976931348623157e+308)
       maxE: EXP_LIMIT,                       // 1 to EXP_LIMIT
 
       // Whether to use cryptographically-secure random number generation, if available.
       crypto: false                          // true/false
     },
 
 
   // ----------------------------------- END OF EDITABLE DEFAULTS ------------------------------- //
 
 
     Decimal, inexact, noConflict, quadrant,
     external = true,
 
     decimalError = '[DecimalError] ',
     invalidArgument = decimalError + 'Invalid argument: ',
     precisionLimitExceeded = decimalError + 'Precision limit exceeded',
     cryptoUnavailable = decimalError + 'crypto unavailable',
     tag = '[object Decimal]',
 
     mathfloor = Math.floor,
     mathpow = Math.pow,
 
     isBinary = /^0b([01]+(\.[01]*)?|\.[01]+)(p[+-]?\d+)?$/i,
     isHex = /^0x([0-9a-f]+(\.[0-9a-f]*)?|\.[0-9a-f]+)(p[+-]?\d+)?$/i,
     isOctal = /^0o([0-7]+(\.[0-7]*)?|\.[0-7]+)(p[+-]?\d+)?$/i,
     isDecimal = /^(\d+(\.\d*)?|\.\d+)(e[+-]?\d+)?$/i,
 
     BASE = 1e7,
     LOG_BASE = 7,
     MAX_SAFE_INTEGER = 9007199254740991,
 
     LN10_PRECISION = LN10.length - 1,
     PI_PRECISION = PI.length - 1,
 
     // Decimal.prototype object
     P = { toStringTag: tag };
 
 
   // Decimal prototype methods
 
 
   /*
    *  absoluteValue             abs
    *  ceil
    *  clampedTo                 clamp
    *  comparedTo                cmp
    *  cosine                    cos
    *  cubeRoot                  cbrt
    *  decimalPlaces             dp
    *  dividedBy                 div
    *  dividedToIntegerBy        divToInt
    *  equals                    eq
    *  floor
    *  greaterThan               gt
    *  greaterThanOrEqualTo      gte
    *  hyperbolicCosine          cosh
    *  hyperbolicSine            sinh
    *  hyperbolicTangent         tanh
    *  inverseCosine             acos
    *  inverseHyperbolicCosine   acosh
    *  inverseHyperbolicSine     asinh
    *  inverseHyperbolicTangent  atanh
    *  inverseSine               asin
    *  inverseTangent            atan
    *  isFinite
    *  isInteger                 isInt
    *  isNaN
    *  isNegative                isNeg
    *  isPositive                isPos
    *  isZero
    *  lessThan                  lt
    *  lessThanOrEqualTo         lte
    *  logarithm                 log
    *  [maximum]                 [max]
    *  [minimum]                 [min]
    *  minus                     sub
    *  modulo                    mod
    *  naturalExponential        exp
    *  naturalLogarithm          ln
    *  negated                   neg
    *  plus                      add
    *  precision                 sd
    *  round
    *  sine                      sin
    *  squareRoot                sqrt
    *  tangent                   tan
    *  times                     mul
    *  toBinary
    *  toDecimalPlaces           toDP
    *  toExponential
    *  toFixed
    *  toFraction
    *  toHexadecimal             toHex
    *  toNearest
    *  toNumber
    *  toOctal
    *  toPower                   pow
    *  toPrecision
    *  toSignificantDigits       toSD
    *  toString
    *  truncated                 trunc
    *  valueOf                   toJSON
    */
 
 
   /*
    * Return a new Decimal whose value is the absolute value of this Decimal.
    *
    */
   P.absoluteValue = P.abs = function () {
     var x = new this.constructor(this);
     if (x.s < 0) x.s = 1;
     return finalise(x);
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal rounded to a whole number in the
    * direction of positive Infinity.
    *
    */
   P.ceil = function () {
     return finalise(new this.constructor(this), this.e + 1, 2);
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal clamped to the range
    * delineated by `min` and `max`.
    *
    * min {number|string|Decimal}
    * max {number|string|Decimal}
    *
    */
   P.clampedTo = P.clamp = function (min, max) {
     var k,
       x = this,
       Ctor = x.constructor;
     min = new Ctor(min);
     max = new Ctor(max);
     if (!min.s || !max.s) return new Ctor(NaN);
     if (min.gt(max)) throw Error(invalidArgument + max);
     k = x.cmp(min);
     return k < 0 ? min : x.cmp(max) > 0 ? max : new Ctor(x);
   };
 
 
   /*
    * Return
    *   1    if the value of this Decimal is greater than the value of `y`,
    *  -1    if the value of this Decimal is less than the value of `y`,
    *   0    if they have the same value,
    *   NaN  if the value of either Decimal is NaN.
    *
    */
   P.comparedTo = P.cmp = function (y) {
     var i, j, xdL, ydL,
       x = this,
       xd = x.d,
       yd = (y = new x.constructor(y)).d,
       xs = x.s,
       ys = y.s;
 
     // Either NaN or ±Infinity?
     if (!xd || !yd) {
       return !xs || !ys ? NaN : xs !== ys ? xs : xd === yd ? 0 : !xd ^ xs < 0 ? 1 : -1;
     }
 
     // Either zero?
     if (!xd[0] || !yd[0]) return xd[0] ? xs : yd[0] ? -ys : 0;
 
     // Signs differ?
     if (xs !== ys) return xs;
 
     // Compare exponents.
     if (x.e !== y.e) return x.e > y.e ^ xs < 0 ? 1 : -1;
 
     xdL = xd.length;
     ydL = yd.length;
 
     // Compare digit by digit.
     for (i = 0, j = xdL < ydL ? xdL : ydL; i < j; ++i) {
       if (xd[i] !== yd[i]) return xd[i] > yd[i] ^ xs < 0 ? 1 : -1;
     }
 
     // Compare lengths.
     return xdL === ydL ? 0 : xdL > ydL ^ xs < 0 ? 1 : -1;
   };
 
 
   /*
    * Return a new Decimal whose value is the cosine of the value in radians of this Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-1, 1]
    *
    * cos(0)         = 1
    * cos(-0)        = 1
    * cos(Infinity)  = NaN
    * cos(-Infinity) = NaN
    * cos(NaN)       = NaN
    *
    */
   P.cosine = P.cos = function () {
     var pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (!x.d) return new Ctor(NaN);
 
     // cos(0) = cos(-0) = 1
     if (!x.d[0]) return new Ctor(1);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + Math.max(x.e, x.sd()) + LOG_BASE;
     Ctor.rounding = 1;
 
     x = cosine(Ctor, toLessThanHalfPi(Ctor, x));
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return finalise(quadrant == 2 || quadrant == 3 ? x.neg() : x, pr, rm, true);
   };
 
 
   /*
    *
    * Return a new Decimal whose value is the cube root of the value of this Decimal, rounded to
    * `precision` significant digits using rounding mode `rounding`.
    *
    *  cbrt(0)  =  0
    *  cbrt(-0) = -0
    *  cbrt(1)  =  1
    *  cbrt(-1) = -1
    *  cbrt(N)  =  N
    *  cbrt(-I) = -I
    *  cbrt(I)  =  I
    *
    * Math.cbrt(x) = (x < 0 ? -Math.pow(-x, 1/3) : Math.pow(x, 1/3))
    *
    */
   P.cubeRoot = P.cbrt = function () {
     var e, m, n, r, rep, s, sd, t, t3, t3plusx,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite() || x.isZero()) return new Ctor(x);
     external = false;
 
     // Initial estimate.
     s = x.s * mathpow(x.s * x, 1 / 3);
 
      // Math.cbrt underflow/overflow?
      // Pass x to Math.pow as integer, then adjust the exponent of the result.
     if (!s || Math.abs(s) == 1 / 0) {
       n = digitsToString(x.d);
       e = x.e;
 
       // Adjust n exponent so it is a multiple of 3 away from x exponent.
       if (s = (e - n.length + 1) % 3) n += (s == 1 || s == -2 ? '0' : '00');
       s = mathpow(n, 1 / 3);
 
       // Rarely, e may be one less than the result exponent value.
       e = mathfloor((e + 1) / 3) - (e % 3 == (e < 0 ? -1 : 2));
 
       if (s == 1 / 0) {
         n = '5e' + e;
       } else {
         n = s.toExponential();
         n = n.slice(0, n.indexOf('e') + 1) + e;
       }
 
       r = new Ctor(n);
       r.s = x.s;
     } else {
       r = new Ctor(s.toString());
     }
 
     sd = (e = Ctor.precision) + 3;
 
     // Halley's method.
     // TODO? Compare Newton's method.
     for (;;) {
       t = r;
       t3 = t.times(t).times(t);
       t3plusx = t3.plus(x);
       r = divide(t3plusx.plus(x).times(t), t3plusx.plus(t3), sd + 2, 1);
 
       // TODO? Replace with for-loop and checkRoundingDigits.
       if (digitsToString(t.d).slice(0, sd) === (n = digitsToString(r.d)).slice(0, sd)) {
         n = n.slice(sd - 3, sd + 1);
 
         // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or 4999
         // , i.e. approaching a rounding boundary, continue the iteration.
         if (n == '9999' || !rep && n == '4999') {
 
           // On the first iteration only, check to see if rounding up gives the exact result as the
           // nines may infinitely repeat.
           if (!rep) {
             finalise(t, e + 1, 0);
 
             if (t.times(t).times(t).eq(x)) {
               r = t;
               break;
             }
           }
 
           sd += 4;
           rep = 1;
         } else {
 
           // If the rounding digits are null, 0{0,4} or 50{0,3}, check for an exact result.
           // If not, then there are further digits and m will be truthy.
           if (!+n || !+n.slice(1) && n.charAt(0) == '5') {
 
             // Truncate to the first rounding digit.
             finalise(r, e + 1, 1);
             m = !r.times(r).times(r).eq(x);
           }
 
           break;
         }
       }
     }
 
     external = true;
 
     return finalise(r, e, Ctor.rounding, m);
   };
 
 
   /*
    * Return the number of decimal places of the value of this Decimal.
    *
    */
   P.decimalPlaces = P.dp = function () {
     var w,
       d = this.d,
       n = NaN;
 
     if (d) {
       w = d.length - 1;
       n = (w - mathfloor(this.e / LOG_BASE)) * LOG_BASE;
 
       // Subtract the number of trailing zeros of the last word.
       w = d[w];
       if (w) for (; w % 10 == 0; w /= 10) n--;
       if (n < 0) n = 0;
     }
 
     return n;
   };
 
 
   /*
    *  n / 0 = I
    *  n / N = N
    *  n / I = 0
    *  0 / n = 0
    *  0 / 0 = N
    *  0 / N = N
    *  0 / I = 0
    *  N / n = N
    *  N / 0 = N
    *  N / N = N
    *  N / I = N
    *  I / n = I
    *  I / 0 = I
    *  I / N = N
    *  I / I = N
    *
    * Return a new Decimal whose value is the value of this Decimal divided by `y`, rounded to
    * `precision` significant digits using rounding mode `rounding`.
    *
    */
   P.dividedBy = P.div = function (y) {
     return divide(this, new this.constructor(y));
   };
 
 
   /*
    * Return a new Decimal whose value is the integer part of dividing the value of this Decimal
    * by the value of `y`, rounded to `precision` significant digits using rounding mode `rounding`.
    *
    */
   P.dividedToIntegerBy = P.divToInt = function (y) {
     var x = this,
       Ctor = x.constructor;
     return finalise(divide(x, new Ctor(y), 0, 1, 1), Ctor.precision, Ctor.rounding);
   };
 
 
   /*
    * Return true if the value of this Decimal is equal to the value of `y`, otherwise return false.
    *
    */
   P.equals = P.eq = function (y) {
     return this.cmp(y) === 0;
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal rounded to a whole number in the
    * direction of negative Infinity.
    *
    */
   P.floor = function () {
     return finalise(new this.constructor(this), this.e + 1, 3);
   };
 
 
   /*
    * Return true if the value of this Decimal is greater than the value of `y`, otherwise return
    * false.
    *
    */
   P.greaterThan = P.gt = function (y) {
     return this.cmp(y) > 0;
   };
 
 
   /*
    * Return true if the value of this Decimal is greater than or equal to the value of `y`,
    * otherwise return false.
    *
    */
   P.greaterThanOrEqualTo = P.gte = function (y) {
     var k = this.cmp(y);
     return k == 1 || k === 0;
   };
 
 
   /*
    * Return a new Decimal whose value is the hyperbolic cosine of the value in radians of this
    * Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [1, Infinity]
    *
    * cosh(x) = 1 + x^2/2! + x^4/4! + x^6/6! + ...
    *
    * cosh(0)         = 1
    * cosh(-0)        = 1
    * cosh(Infinity)  = Infinity
    * cosh(-Infinity) = Infinity
    * cosh(NaN)       = NaN
    *
    *  x        time taken (ms)   result
    * 1000      9                 9.8503555700852349694e+433
    * 10000     25                4.4034091128314607936e+4342
    * 100000    171               1.4033316802130615897e+43429
    * 1000000   3817              1.5166076984010437725e+434294
    * 10000000  abandoned after 2 minute wait
    *
    * TODO? Compare performance of cosh(x) = 0.5 * (exp(x) + exp(-x))
    *
    */
   P.hyperbolicCosine = P.cosh = function () {
     var k, n, pr, rm, len,
       x = this,
       Ctor = x.constructor,
       one = new Ctor(1);
 
     if (!x.isFinite()) return new Ctor(x.s ? 1 / 0 : NaN);
     if (x.isZero()) return one;
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + Math.max(x.e, x.sd()) + 4;
     Ctor.rounding = 1;
     len = x.d.length;
 
     // Argument reduction: cos(4x) = 1 - 8cos^2(x) + 8cos^4(x) + 1
     // i.e. cos(x) = 1 - cos^2(x/4)(8 - 8cos^2(x/4))
 
     // Estimate the optimum number of times to use the argument reduction.
     // TODO? Estimation reused from cosine() and may not be optimal here.
     if (len < 32) {
       k = Math.ceil(len / 3);
       n = (1 / tinyPow(4, k)).toString();
     } else {
       k = 16;
       n = '2.3283064365386962890625e-10';
     }
 
     x = taylorSeries(Ctor, 1, x.times(n), new Ctor(1), true);
 
     // Reverse argument reduction
     var cosh2_x,
       i = k,
       d8 = new Ctor(8);
     for (; i--;) {
       cosh2_x = x.times(x);
       x = one.minus(cosh2_x.times(d8.minus(cosh2_x.times(d8))));
     }
 
     return finalise(x, Ctor.precision = pr, Ctor.rounding = rm, true);
   };
 
 
   /*
    * Return a new Decimal whose value is the hyperbolic sine of the value in radians of this
    * Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-Infinity, Infinity]
    *
    * sinh(x) = x + x^3/3! + x^5/5! + x^7/7! + ...
    *
    * sinh(0)         = 0
    * sinh(-0)        = -0
    * sinh(Infinity)  = Infinity
    * sinh(-Infinity) = -Infinity
    * sinh(NaN)       = NaN
    *
    * x        time taken (ms)
    * 10       2 ms
    * 100      5 ms
    * 1000     14 ms
    * 10000    82 ms
    * 100000   886 ms            1.4033316802130615897e+43429
    * 200000   2613 ms
    * 300000   5407 ms
    * 400000   8824 ms
    * 500000   13026 ms          8.7080643612718084129e+217146
    * 1000000  48543 ms
    *
    * TODO? Compare performance of sinh(x) = 0.5 * (exp(x) - exp(-x))
    *
    */
   P.hyperbolicSine = P.sinh = function () {
     var k, pr, rm, len,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite() || x.isZero()) return new Ctor(x);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + Math.max(x.e, x.sd()) + 4;
     Ctor.rounding = 1;
     len = x.d.length;
 
     if (len < 3) {
       x = taylorSeries(Ctor, 2, x, x, true);
     } else {
 
       // Alternative argument reduction: sinh(3x) = sinh(x)(3 + 4sinh^2(x))
       // i.e. sinh(x) = sinh(x/3)(3 + 4sinh^2(x/3))
       // 3 multiplications and 1 addition
 
       // Argument reduction: sinh(5x) = sinh(x)(5 + sinh^2(x)(20 + 16sinh^2(x)))
       // i.e. sinh(x) = sinh(x/5)(5 + sinh^2(x/5)(20 + 16sinh^2(x/5)))
       // 4 multiplications and 2 additions
 
       // Estimate the optimum number of times to use the argument reduction.
       k = 1.4 * Math.sqrt(len);
       k = k > 16 ? 16 : k | 0;
 
       x = x.times(1 / tinyPow(5, k));
       x = taylorSeries(Ctor, 2, x, x, true);
 
       // Reverse argument reduction
       var sinh2_x,
         d5 = new Ctor(5),
         d16 = new Ctor(16),
         d20 = new Ctor(20);
       for (; k--;) {
         sinh2_x = x.times(x);
         x = x.times(d5.plus(sinh2_x.times(d16.times(sinh2_x).plus(d20))));
       }
     }
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return finalise(x, pr, rm, true);
   };
 
 
   /*
    * Return a new Decimal whose value is the hyperbolic tangent of the value in radians of this
    * Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-1, 1]
    *
    * tanh(x) = sinh(x) / cosh(x)
    *
    * tanh(0)         = 0
    * tanh(-0)        = -0
    * tanh(Infinity)  = 1
    * tanh(-Infinity) = -1
    * tanh(NaN)       = NaN
    *
    */
   P.hyperbolicTangent = P.tanh = function () {
     var pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite()) return new Ctor(x.s);
     if (x.isZero()) return new Ctor(x);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + 7;
     Ctor.rounding = 1;
 
     return divide(x.sinh(), x.cosh(), Ctor.precision = pr, Ctor.rounding = rm);
   };
 
 
   /*
    * Return a new Decimal whose value is the arccosine (inverse cosine) in radians of the value of
    * this Decimal.
    *
    * Domain: [-1, 1]
    * Range: [0, pi]
    *
    * acos(x) = pi/2 - asin(x)
    *
    * acos(0)       = pi/2
    * acos(-0)      = pi/2
    * acos(1)       = 0
    * acos(-1)      = pi
    * acos(1/2)     = pi/3
    * acos(-1/2)    = 2*pi/3
    * acos(|x| > 1) = NaN
    * acos(NaN)     = NaN
    *
    */
   P.inverseCosine = P.acos = function () {
     var halfPi,
       x = this,
       Ctor = x.constructor,
       k = x.abs().cmp(1),
       pr = Ctor.precision,
       rm = Ctor.rounding;
 
     if (k !== -1) {
       return k === 0
         // |x| is 1
         ? x.isNeg() ? getPi(Ctor, pr, rm) : new Ctor(0)
         // |x| > 1 or x is NaN
         : new Ctor(NaN);
     }
 
     if (x.isZero()) return getPi(Ctor, pr + 4, rm).times(0.5);
 
     // TODO? Special case acos(0.5) = pi/3 and acos(-0.5) = 2*pi/3
 
     Ctor.precision = pr + 6;
     Ctor.rounding = 1;
 
     x = x.asin();
     halfPi = getPi(Ctor, pr + 4, rm).times(0.5);
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return halfPi.minus(x);
   };
 
 
   /*
    * Return a new Decimal whose value is the inverse of the hyperbolic cosine in radians of the
    * value of this Decimal.
    *
    * Domain: [1, Infinity]
    * Range: [0, Infinity]
    *
    * acosh(x) = ln(x + sqrt(x^2 - 1))
    *
    * acosh(x < 1)     = NaN
    * acosh(NaN)       = NaN
    * acosh(Infinity)  = Infinity
    * acosh(-Infinity) = NaN
    * acosh(0)         = NaN
    * acosh(-0)        = NaN
    * acosh(1)         = 0
    * acosh(-1)        = NaN
    *
    */
   P.inverseHyperbolicCosine = P.acosh = function () {
     var pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (x.lte(1)) return new Ctor(x.eq(1) ? 0 : NaN);
     if (!x.isFinite()) return new Ctor(x);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + Math.max(Math.abs(x.e), x.sd()) + 4;
     Ctor.rounding = 1;
     external = false;
 
     x = x.times(x).minus(1).sqrt().plus(x);
 
     external = true;
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return x.ln();
   };
 
 
   /*
    * Return a new Decimal whose value is the inverse of the hyperbolic sine in radians of the value
    * of this Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-Infinity, Infinity]
    *
    * asinh(x) = ln(x + sqrt(x^2 + 1))
    *
    * asinh(NaN)       = NaN
    * asinh(Infinity)  = Infinity
    * asinh(-Infinity) = -Infinity
    * asinh(0)         = 0
    * asinh(-0)        = -0
    *
    */
   P.inverseHyperbolicSine = P.asinh = function () {
     var pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite() || x.isZero()) return new Ctor(x);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + 2 * Math.max(Math.abs(x.e), x.sd()) + 6;
     Ctor.rounding = 1;
     external = false;
 
     x = x.times(x).plus(1).sqrt().plus(x);
 
     external = true;
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return x.ln();
   };
 
 
   /*
    * Return a new Decimal whose value is the inverse of the hyperbolic tangent in radians of the
    * value of this Decimal.
    *
    * Domain: [-1, 1]
    * Range: [-Infinity, Infinity]
    *
    * atanh(x) = 0.5 * ln((1 + x) / (1 - x))
    *
    * atanh(|x| > 1)   = NaN
    * atanh(NaN)       = NaN
    * atanh(Infinity)  = NaN
    * atanh(-Infinity) = NaN
    * atanh(0)         = 0
    * atanh(-0)        = -0
    * atanh(1)         = Infinity
    * atanh(-1)        = -Infinity
    *
    */
   P.inverseHyperbolicTangent = P.atanh = function () {
     var pr, rm, wpr, xsd,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite()) return new Ctor(NaN);
     if (x.e >= 0) return new Ctor(x.abs().eq(1) ? x.s / 0 : x.isZero() ? x : NaN);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     xsd = x.sd();
 
     if (Math.max(xsd, pr) < 2 * -x.e - 1) return finalise(new Ctor(x), pr, rm, true);
 
     Ctor.precision = wpr = xsd - x.e;
 
     x = divide(x.plus(1), new Ctor(1).minus(x), wpr + pr, 1);
 
     Ctor.precision = pr + 4;
     Ctor.rounding = 1;
 
     x = x.ln();
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return x.times(0.5);
   };
 
 
   /*
    * Return a new Decimal whose value is the arcsine (inverse sine) in radians of the value of this
    * Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-pi/2, pi/2]
    *
    * asin(x) = 2*atan(x/(1 + sqrt(1 - x^2)))
    *
    * asin(0)       = 0
    * asin(-0)      = -0
    * asin(1/2)     = pi/6
    * asin(-1/2)    = -pi/6
    * asin(1)       = pi/2
    * asin(-1)      = -pi/2
    * asin(|x| > 1) = NaN
    * asin(NaN)     = NaN
    *
    * TODO? Compare performance of Taylor series.
    *
    */
   P.inverseSine = P.asin = function () {
     var halfPi, k,
       pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (x.isZero()) return new Ctor(x);
 
     k = x.abs().cmp(1);
     pr = Ctor.precision;
     rm = Ctor.rounding;
 
     if (k !== -1) {
 
       // |x| is 1
       if (k === 0) {
         halfPi = getPi(Ctor, pr + 4, rm).times(0.5);
         halfPi.s = x.s;
         return halfPi;
       }
 
       // |x| > 1 or x is NaN
       return new Ctor(NaN);
     }
 
     // TODO? Special case asin(1/2) = pi/6 and asin(-1/2) = -pi/6
 
     Ctor.precision = pr + 6;
     Ctor.rounding = 1;
 
     x = x.div(new Ctor(1).minus(x.times(x)).sqrt().plus(1)).atan();
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return x.times(2);
   };
 
 
   /*
    * Return a new Decimal whose value is the arctangent (inverse tangent) in radians of the value
    * of this Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-pi/2, pi/2]
    *
    * atan(x) = x - x^3/3 + x^5/5 - x^7/7 + ...
    *
    * atan(0)         = 0
    * atan(-0)        = -0
    * atan(1)         = pi/4
    * atan(-1)        = -pi/4
    * atan(Infinity)  = pi/2
    * atan(-Infinity) = -pi/2
    * atan(NaN)       = NaN
    *
    */
   P.inverseTangent = P.atan = function () {
     var i, j, k, n, px, t, r, wpr, x2,
       x = this,
       Ctor = x.constructor,
       pr = Ctor.precision,
       rm = Ctor.rounding;
 
     if (!x.isFinite()) {
       if (!x.s) return new Ctor(NaN);
       if (pr + 4 <= PI_PRECISION) {
         r = getPi(Ctor, pr + 4, rm).times(0.5);
         r.s = x.s;
         return r;
       }
     } else if (x.isZero()) {
       return new Ctor(x);
     } else if (x.abs().eq(1) && pr + 4 <= PI_PRECISION) {
       r = getPi(Ctor, pr + 4, rm).times(0.25);
       r.s = x.s;
       return r;
     }
 
     Ctor.precision = wpr = pr + 10;
     Ctor.rounding = 1;
 
     // TODO? if (x >= 1 && pr <= PI_PRECISION) atan(x) = halfPi * x.s - atan(1 / x);
 
     // Argument reduction
     // Ensure |x| < 0.42
     // atan(x) = 2 * atan(x / (1 + sqrt(1 + x^2)))
 
     k = Math.min(28, wpr / LOG_BASE + 2 | 0);
 
     for (i = k; i; --i) x = x.div(x.times(x).plus(1).sqrt().plus(1));
 
     external = false;
 
     j = Math.ceil(wpr / LOG_BASE);
     n = 1;
     x2 = x.times(x);
     r = new Ctor(x);
     px = x;
 
     // atan(x) = x - x^3/3 + x^5/5 - x^7/7 + ...
     for (; i !== -1;) {
       px = px.times(x2);
       t = r.minus(px.div(n += 2));
 
       px = px.times(x2);
       r = t.plus(px.div(n += 2));
 
       if (r.d[j] !== void 0) for (i = j; r.d[i] === t.d[i] && i--;);
     }
 
     if (k) r = r.times(2 << (k - 1));
 
     external = true;
 
     return finalise(r, Ctor.precision = pr, Ctor.rounding = rm, true);
   };
 
 
   /*
    * Return true if the value of this Decimal is a finite number, otherwise return false.
    *
    */
   P.isFinite = function () {
     return !!this.d;
   };
 
 
   /*
    * Return true if the value of this Decimal is an integer, otherwise return false.
    *
    */
   P.isInteger = P.isInt = function () {
     return !!this.d && mathfloor(this.e / LOG_BASE) > this.d.length - 2;
   };
 
 
   /*
    * Return true if the value of this Decimal is NaN, otherwise return false.
    *
    */
   P.isNaN = function () {
     return !this.s;
   };
 
 
   /*
    * Return true if the value of this Decimal is negative, otherwise return false.
    *
    */
   P.isNegative = P.isNeg = function () {
     return this.s < 0;
   };
 
 
   /*
    * Return true if the value of this Decimal is positive, otherwise return false.
    *
    */
   P.isPositive = P.isPos = function () {
     return this.s > 0;
   };
 
 
   /*
    * Return true if the value of this Decimal is 0 or -0, otherwise return false.
    *
    */
   P.isZero = function () {
     return !!this.d && this.d[0] === 0;
   };
 
 
   /*
    * Return true if the value of this Decimal is less than `y`, otherwise return false.
    *
    */
   P.lessThan = P.lt = function (y) {
     return this.cmp(y) < 0;
   };
 
 
   /*
    * Return true if the value of this Decimal is less than or equal to `y`, otherwise return false.
    *
    */
   P.lessThanOrEqualTo = P.lte = function (y) {
     return this.cmp(y) < 1;
   };
 
 
   /*
    * Return the logarithm of the value of this Decimal to the specified base, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * If no base is specified, return log[10](arg).
    *
    * log[base](arg) = ln(arg) / ln(base)
    *
    * The result will always be correctly rounded if the base of the log is 10, and 'almost always'
    * otherwise:
    *
    * Depending on the rounding mode, the result may be incorrectly rounded if the first fifteen
    * rounding digits are [49]99999999999999 or [50]00000000000000. In that case, the maximum error
    * between the result and the correctly rounded result will be one ulp (unit in the last place).
    *
    * log[-b](a)       = NaN
    * log[0](a)        = NaN
    * log[1](a)        = NaN
    * log[NaN](a)      = NaN
    * log[Infinity](a) = NaN
    * log[b](0)        = -Infinity
    * log[b](-0)       = -Infinity
    * log[b](-a)       = NaN
    * log[b](1)        = 0
    * log[b](Infinity) = Infinity
    * log[b](NaN)      = NaN
    *
    * [base] {number|string|Decimal} The base of the logarithm.
    *
    */
   P.logarithm = P.log = function (base) {
     var isBase10, d, denominator, k, inf, num, sd, r,
       arg = this,
       Ctor = arg.constructor,
       pr = Ctor.precision,
       rm = Ctor.rounding,
       guard = 5;
 
     // Default base is 10.
     if (base == null) {
       base = new Ctor(10);
       isBase10 = true;
     } else {
       base = new Ctor(base);
       d = base.d;
 
       // Return NaN if base is negative, or non-finite, or is 0 or 1.
       if (base.s < 0 || !d || !d[0] || base.eq(1)) return new Ctor(NaN);
 
       isBase10 = base.eq(10);
     }
 
     d = arg.d;
 
     // Is arg negative, non-finite, 0 or 1?
     if (arg.s < 0 || !d || !d[0] || arg.eq(1)) {
       return new Ctor(d && !d[0] ? -1 / 0 : arg.s != 1 ? NaN : d ? 0 : 1 / 0);
     }
 
     // The result will have a non-terminating decimal expansion if base is 10 and arg is not an
     // integer power of 10.
     if (isBase10) {
       if (d.length > 1) {
         inf = true;
       } else {
         for (k = d[0]; k % 10 === 0;) k /= 10;
         inf = k !== 1;
       }
     }
 
     external = false;
     sd = pr + guard;
     num = naturalLogarithm(arg, sd);
     denominator = isBase10 ? getLn10(Ctor, sd + 10) : naturalLogarithm(base, sd);
 
     // The result will have 5 rounding digits.
     r = divide(num, denominator, sd, 1);
 
     // If at a rounding boundary, i.e. the result's rounding digits are [49]9999 or [50]0000,
     // calculate 10 further digits.
     //
     // If the result is known to have an infinite decimal expansion, repeat this until it is clear
     // that the result is above or below the boundary. Otherwise, if after calculating the 10
     // further digits, the last 14 are nines, round up and assume the result is exact.
     // Also assume the result is exact if the last 14 are zero.
     //
     // Example of a result that will be incorrectly rounded:
     // log[1048576](4503599627370502) = 2.60000000000000009610279511444746...
     // The above result correctly rounded using ROUND_CEIL to 1 decimal place should be 2.7, but it
     // will be given as 2.6 as there are 15 zeros immediately after the requested decimal place, so
     // the exact result would be assumed to be 2.6, which rounded using ROUND_CEIL to 1 decimal
     // place is still 2.6.
     if (checkRoundingDigits(r.d, k = pr, rm)) {
 
       do {
         sd += 10;
         num = naturalLogarithm(arg, sd);
         denominator = isBase10 ? getLn10(Ctor, sd + 10) : naturalLogarithm(base, sd);
         r = divide(num, denominator, sd, 1);
 
         if (!inf) {
 
           // Check for 14 nines from the 2nd rounding digit, as the first may be 4.
           if (+digitsToString(r.d).slice(k + 1, k + 15) + 1 == 1e14) {
             r = finalise(r, pr + 1, 0);
           }
 
           break;
         }
       } while (checkRoundingDigits(r.d, k += 10, rm));
     }
 
     external = true;
 
     return finalise(r, pr, rm);
   };
 
 
   /*
    * Return a new Decimal whose value is the maximum of the arguments and the value of this Decimal.
    *
    * arguments {number|string|Decimal}
    *
   P.max = function () {
     Array.prototype.push.call(arguments, this);
     return maxOrMin(this.constructor, arguments, 'lt');
   };
    */
 
 
   /*
    * Return a new Decimal whose value is the minimum of the arguments and the value of this Decimal.
    *
    * arguments {number|string|Decimal}
    *
   P.min = function () {
     Array.prototype.push.call(arguments, this);
     return maxOrMin(this.constructor, arguments, 'gt');
   };
    */
 
 
   /*
    *  n - 0 = n
    *  n - N = N
    *  n - I = -I
    *  0 - n = -n
    *  0 - 0 = 0
    *  0 - N = N
    *  0 - I = -I
    *  N - n = N
    *  N - 0 = N
    *  N - N = N
    *  N - I = N
    *  I - n = I
    *  I - 0 = I
    *  I - N = N
    *  I - I = N
    *
    * Return a new Decimal whose value is the value of this Decimal minus `y`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    */
   P.minus = P.sub = function (y) {
     var d, e, i, j, k, len, pr, rm, xd, xe, xLTy, yd,
       x = this,
       Ctor = x.constructor;
 
     y = new Ctor(y);
 
     // If either is not finite...
     if (!x.d || !y.d) {
 
       // Return NaN if either is NaN.
       if (!x.s || !y.s) y = new Ctor(NaN);
 
       // Return y negated if x is finite and y is ±Infinity.
       else if (x.d) y.s = -y.s;
 
       // Return x if y is finite and x is ±Infinity.
       // Return x if both are ±Infinity with different signs.
       // Return NaN if both are ±Infinity with the same sign.
       else y = new Ctor(y.d || x.s !== y.s ? x : NaN);
 
       return y;
     }
 
     // If signs differ...
     if (x.s != y.s) {
       y.s = -y.s;
       return x.plus(y);
     }
 
     xd = x.d;
     yd = y.d;
     pr = Ctor.precision;
     rm = Ctor.rounding;
 
     // If either is zero...
     if (!xd[0] || !yd[0]) {
 
       // Return y negated if x is zero and y is non-zero.
       if (yd[0]) y.s = -y.s;
 
       // Return x if y is zero and x is non-zero.
       else if (xd[0]) y = new Ctor(x);
 
       // Return zero if both are zero.
       // From IEEE 754 (2008) 6.3: 0 - 0 = -0 - -0 = -0 when rounding to -Infinity.
       else return new Ctor(rm === 3 ? -0 : 0);
 
       return external ? finalise(y, pr, rm) : y;
     }
 
     // x and y are finite, non-zero numbers with the same sign.
 
     // Calculate base 1e7 exponents.
     e = mathfloor(y.e / LOG_BASE);
     xe = mathfloor(x.e / LOG_BASE);
 
     xd = xd.slice();
     k = xe - e;
 
     // If base 1e7 exponents differ...
     if (k) {
       xLTy = k < 0;
 
       if (xLTy) {
         d = xd;
         k = -k;
         len = yd.length;
       } else {
         d = yd;
         e = xe;
         len = xd.length;
       }
 
       // Numbers with massively different exponents would result in a very high number of
       // zeros needing to be prepended, but this can be avoided while still ensuring correct
       // rounding by limiting the number of zeros to `Math.ceil(pr / LOG_BASE) + 2`.
       i = Math.max(Math.ceil(pr / LOG_BASE), len) + 2;
 
       if (k > i) {
         k = i;
         d.length = 1;
       }
 
       // Prepend zeros to equalise exponents.
       d.reverse();
       for (i = k; i--;) d.push(0);
       d.reverse();
 
     // Base 1e7 exponents equal.
     } else {
 
       // Check digits to determine which is the bigger number.
 
       i = xd.length;
       len = yd.length;
       xLTy = i < len;
       if (xLTy) len = i;
 
       for (i = 0; i < len; i++) {
         if (xd[i] != yd[i]) {
           xLTy = xd[i] < yd[i];
           break;
         }
       }
 
       k = 0;
     }
 
     if (xLTy) {
       d = xd;
       xd = yd;
       yd = d;
       y.s = -y.s;
     }
 
     len = xd.length;
 
     // Append zeros to `xd` if shorter.
     // Don't add zeros to `yd` if shorter as subtraction only needs to start at `yd` length.
     for (i = yd.length - len; i > 0; --i) xd[len++] = 0;
 
     // Subtract yd from xd.
     for (i = yd.length; i > k;) {
 
       if (xd[--i] < yd[i]) {
         for (j = i; j && xd[--j] === 0;) xd[j] = BASE - 1;
         --xd[j];
         xd[i] += BASE;
       }
 
       xd[i] -= yd[i];
     }
 
     // Remove trailing zeros.
     for (; xd[--len] === 0;) xd.pop();
 
     // Remove leading zeros and adjust exponent accordingly.
     for (; xd[0] === 0; xd.shift()) --e;
 
     // Zero?
     if (!xd[0]) return new Ctor(rm === 3 ? -0 : 0);
 
     y.d = xd;
     y.e = getBase10Exponent(xd, e);
 
     return external ? finalise(y, pr, rm) : y;
   };
 
 
   /*
    *   n % 0 =  N
    *   n % N =  N
    *   n % I =  n
    *   0 % n =  0
    *  -0 % n = -0
    *   0 % 0 =  N
    *   0 % N =  N
    *   0 % I =  0
    *   N % n =  N
    *   N % 0 =  N
    *   N % N =  N
    *   N % I =  N
    *   I % n =  N
    *   I % 0 =  N
    *   I % N =  N
    *   I % I =  N
    *
    * Return a new Decimal whose value is the value of this Decimal modulo `y`, rounded to
    * `precision` significant digits using rounding mode `rounding`.
    *
    * The result depends on the modulo mode.
    *
    */
   P.modulo = P.mod = function (y) {
     var q,
       x = this,
       Ctor = x.constructor;
 
     y = new Ctor(y);
 
     // Return NaN if x is ±Infinity or NaN, or y is NaN or ±0.
     if (!x.d || !y.s || y.d && !y.d[0]) return new Ctor(NaN);
 
     // Return x if y is ±Infinity or x is ±0.
     if (!y.d || x.d && !x.d[0]) {
       return finalise(new Ctor(x), Ctor.precision, Ctor.rounding);
     }
 
     // Prevent rounding of intermediate calculations.
     external = false;
 
     if (Ctor.modulo == 9) {
 
       // Euclidian division: q = sign(y) * floor(x / abs(y))
       // result = x - q * y    where  0 <= result < abs(y)
       q = divide(x, y.abs(), 0, 3, 1);
       q.s *= y.s;
     } else {
       q = divide(x, y, 0, Ctor.modulo, 1);
     }
 
     q = q.times(y);
 
     external = true;
 
     return x.minus(q);
   };
 
 
   /*
    * Return a new Decimal whose value is the natural exponential of the value of this Decimal,
    * i.e. the base e raised to the power the value of this Decimal, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    */
   P.naturalExponential = P.exp = function () {
     return naturalExponential(this);
   };
 
 
   /*
    * Return a new Decimal whose value is the natural logarithm of the value of this Decimal,
    * rounded to `precision` significant digits using rounding mode `rounding`.
    *
    */
   P.naturalLogarithm = P.ln = function () {
     return naturalLogarithm(this);
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal negated, i.e. as if multiplied by
    * -1.
    *
    */
   P.negated = P.neg = function () {
     var x = new this.constructor(this);
     x.s = -x.s;
     return finalise(x);
   };
 
 
   /*
    *  n + 0 = n
    *  n + N = N
    *  n + I = I
    *  0 + n = n
    *  0 + 0 = 0
    *  0 + N = N
    *  0 + I = I
    *  N + n = N
    *  N + 0 = N
    *  N + N = N
    *  N + I = N
    *  I + n = I
    *  I + 0 = I
    *  I + N = N
    *  I + I = I
    *
    * Return a new Decimal whose value is the value of this Decimal plus `y`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    */
   P.plus = P.add = function (y) {
     var carry, d, e, i, k, len, pr, rm, xd, yd,
       x = this,
       Ctor = x.constructor;
 
     y = new Ctor(y);
 
     // If either is not finite...
     if (!x.d || !y.d) {
 
       // Return NaN if either is NaN.
       if (!x.s || !y.s) y = new Ctor(NaN);
 
       // Return x if y is finite and x is ±Infinity.
       // Return x if both are ±Infinity with the same sign.
       // Return NaN if both are ±Infinity with different signs.
       // Return y if x is finite and y is ±Infinity.
       else if (!x.d) y = new Ctor(y.d || x.s === y.s ? x : NaN);
 
       return y;
     }
 
      // If signs differ...
     if (x.s != y.s) {
       y.s = -y.s;
       return x.minus(y);
     }
 
     xd = x.d;
     yd = y.d;
     pr = Ctor.precision;
     rm = Ctor.rounding;
 
     // If either is zero...
     if (!xd[0] || !yd[0]) {
 
       // Return x if y is zero.
       // Return y if y is non-zero.
       if (!yd[0]) y = new Ctor(x);
 
       return external ? finalise(y, pr, rm) : y;
     }
 
     // x and y are finite, non-zero numbers with the same sign.
 
     // Calculate base 1e7 exponents.
     k = mathfloor(x.e / LOG_BASE);
     e = mathfloor(y.e / LOG_BASE);
 
     xd = xd.slice();
     i = k - e;
 
     // If base 1e7 exponents differ...
     if (i) {
 
       if (i < 0) {
         d = xd;
         i = -i;
         len = yd.length;
       } else {
         d = yd;
         e = k;
         len = xd.length;
       }
 
       // Limit number of zeros prepended to max(ceil(pr / LOG_BASE), len) + 1.
       k = Math.ceil(pr / LOG_BASE);
       len = k > len ? k + 1 : len + 1;
 
       if (i > len) {
         i = len;
         d.length = 1;
       }
 
       // Prepend zeros to equalise exponents. Note: Faster to use reverse then do unshifts.
       d.reverse();
       for (; i--;) d.push(0);
       d.reverse();
     }
 
     len = xd.length;
     i = yd.length;
 
     // If yd is longer than xd, swap xd and yd so xd points to the longer array.
     if (len - i < 0) {
       i = len;
       d = yd;
       yd = xd;
       xd = d;
     }
 
     // Only start adding at yd.length - 1 as the further digits of xd can be left as they are.
     for (carry = 0; i;) {
       carry = (xd[--i] = xd[i] + yd[i] + carry) / BASE | 0;
       xd[i] %= BASE;
     }
 
     if (carry) {
       xd.unshift(carry);
       ++e;
     }
 
     // Remove trailing zeros.
     // No need to check for zero, as +x + +y != 0 && -x + -y != 0
     for (len = xd.length; xd[--len] == 0;) xd.pop();
 
     y.d = xd;
     y.e = getBase10Exponent(xd, e);
 
     return external ? finalise(y, pr, rm) : y;
   };
 
 
   /*
    * Return the number of significant digits of the value of this Decimal.
    *
    * [z] {boolean|number} Whether to count integer-part trailing zeros: true, false, 1 or 0.
    *
    */
   P.precision = P.sd = function (z) {
     var k,
       x = this;
 
     if (z !== void 0 && z !== !!z && z !== 1 && z !== 0) throw Error(invalidArgument + z);
 
     if (x.d) {
       k = getPrecision(x.d);
       if (z && x.e + 1 > k) k = x.e + 1;
     } else {
       k = NaN;
     }
 
     return k;
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal rounded to a whole number using
    * rounding mode `rounding`.
    *
    */
   P.round = function () {
     var x = this,
       Ctor = x.constructor;
 
     return finalise(new Ctor(x), x.e + 1, Ctor.rounding);
   };
 
 
   /*
    * Return a new Decimal whose value is the sine of the value in radians of this Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-1, 1]
    *
    * sin(x) = x - x^3/3! + x^5/5! - ...
    *
    * sin(0)         = 0
    * sin(-0)        = -0
    * sin(Infinity)  = NaN
    * sin(-Infinity) = NaN
    * sin(NaN)       = NaN
    *
    */
   P.sine = P.sin = function () {
     var pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite()) return new Ctor(NaN);
     if (x.isZero()) return new Ctor(x);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + Math.max(x.e, x.sd()) + LOG_BASE;
     Ctor.rounding = 1;
 
     x = sine(Ctor, toLessThanHalfPi(Ctor, x));
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return finalise(quadrant > 2 ? x.neg() : x, pr, rm, true);
   };
 
 
   /*
    * Return a new Decimal whose value is the square root of this Decimal, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    *  sqrt(-n) =  N
    *  sqrt(N)  =  N
    *  sqrt(-I) =  N
    *  sqrt(I)  =  I
    *  sqrt(0)  =  0
    *  sqrt(-0) = -0
    *
    */
   P.squareRoot = P.sqrt = function () {
     var m, n, sd, r, rep, t,
       x = this,
       d = x.d,
       e = x.e,
       s = x.s,
       Ctor = x.constructor;
 
     // Negative/NaN/Infinity/zero?
     if (s !== 1 || !d || !d[0]) {
       return new Ctor(!s || s < 0 && (!d || d[0]) ? NaN : d ? x : 1 / 0);
     }
 
     external = false;
 
     // Initial estimate.
     s = Math.sqrt(+x);
 
     // Math.sqrt underflow/overflow?
     // Pass x to Math.sqrt as integer, then adjust the exponent of the result.
     if (s == 0 || s == 1 / 0) {
       n = digitsToString(d);
 
       if ((n.length + e) % 2 == 0) n += '0';
       s = Math.sqrt(n);
       e = mathfloor((e + 1) / 2) - (e < 0 || e % 2);
 
       if (s == 1 / 0) {
         n = '5e' + e;
       } else {
         n = s.toExponential();
         n = n.slice(0, n.indexOf('e') + 1) + e;
       }
 
       r = new Ctor(n);
     } else {
       r = new Ctor(s.toString());
     }
 
     sd = (e = Ctor.precision) + 3;
 
     // Newton-Raphson iteration.
     for (;;) {
       t = r;
       r = t.plus(divide(x, t, sd + 2, 1)).times(0.5);
 
       // TODO? Replace with for-loop and checkRoundingDigits.
       if (digitsToString(t.d).slice(0, sd) === (n = digitsToString(r.d)).slice(0, sd)) {
         n = n.slice(sd - 3, sd + 1);
 
         // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or
         // 4999, i.e. approaching a rounding boundary, continue the iteration.
         if (n == '9999' || !rep && n == '4999') {
 
           // On the first iteration only, check to see if rounding up gives the exact result as the
           // nines may infinitely repeat.
           if (!rep) {
             finalise(t, e + 1, 0);
 
             if (t.times(t).eq(x)) {
               r = t;
               break;
             }
           }
 
           sd += 4;
           rep = 1;
         } else {
 
           // If the rounding digits are null, 0{0,4} or 50{0,3}, check for an exact result.
           // If not, then there are further digits and m will be truthy.
           if (!+n || !+n.slice(1) && n.charAt(0) == '5') {
 
             // Truncate to the first rounding digit.
             finalise(r, e + 1, 1);
             m = !r.times(r).eq(x);
           }
 
           break;
         }
       }
     }
 
     external = true;
 
     return finalise(r, e, Ctor.rounding, m);
   };
 
 
   /*
    * Return a new Decimal whose value is the tangent of the value in radians of this Decimal.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-Infinity, Infinity]
    *
    * tan(0)         = 0
    * tan(-0)        = -0
    * tan(Infinity)  = NaN
    * tan(-Infinity) = NaN
    * tan(NaN)       = NaN
    *
    */
   P.tangent = P.tan = function () {
     var pr, rm,
       x = this,
       Ctor = x.constructor;
 
     if (!x.isFinite()) return new Ctor(NaN);
     if (x.isZero()) return new Ctor(x);
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
     Ctor.precision = pr + 10;
     Ctor.rounding = 1;
 
     x = x.sin();
     x.s = 1;
     x = divide(x, new Ctor(1).minus(x.times(x)).sqrt(), pr + 10, 0);
 
     Ctor.precision = pr;
     Ctor.rounding = rm;
 
     return finalise(quadrant == 2 || quadrant == 4 ? x.neg() : x, pr, rm, true);
   };
 
 
   /*
    *  n * 0 = 0
    *  n * N = N
    *  n * I = I
    *  0 * n = 0
    *  0 * 0 = 0
    *  0 * N = N
    *  0 * I = N
    *  N * n = N
    *  N * 0 = N
    *  N * N = N
    *  N * I = N
    *  I * n = I
    *  I * 0 = N
    *  I * N = N
    *  I * I = I
    *
    * Return a new Decimal whose value is this Decimal times `y`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    */
   P.times = P.mul = function (y) {
     var carry, e, i, k, r, rL, t, xdL, ydL,
       x = this,
       Ctor = x.constructor,
       xd = x.d,
       yd = (y = new Ctor(y)).d;
 
     y.s *= x.s;
 
      // If either is NaN, ±Infinity or ±0...
     if (!xd || !xd[0] || !yd || !yd[0]) {
 
       return new Ctor(!y.s || xd && !xd[0] && !yd || yd && !yd[0] && !xd
 
         // Return NaN if either is NaN.
         // Return NaN if x is ±0 and y is ±Infinity, or y is ±0 and x is ±Infinity.
         ? NaN
 
         // Return ±Infinity if either is ±Infinity.
         // Return ±0 if either is ±0.
         : !xd || !yd ? y.s / 0 : y.s * 0);
     }
 
     e = mathfloor(x.e / LOG_BASE) + mathfloor(y.e / LOG_BASE);
     xdL = xd.length;
     ydL = yd.length;
 
     // Ensure xd points to the longer array.
     if (xdL < ydL) {
       r = xd;
       xd = yd;
       yd = r;
       rL = xdL;
       xdL = ydL;
       ydL = rL;
     }
 
     // Initialise the result array with zeros.
     r = [];
     rL = xdL + ydL;
     for (i = rL; i--;) r.push(0);
 
     // Multiply!
     for (i = ydL; --i >= 0;) {
       carry = 0;
       for (k = xdL + i; k > i;) {
         t = r[k] + yd[i] * xd[k - i - 1] + carry;
         r[k--] = t % BASE | 0;
         carry = t / BASE | 0;
       }
 
       r[k] = (r[k] + carry) % BASE | 0;
     }
 
     // Remove trailing zeros.
     for (; !r[--rL];) r.pop();
 
     if (carry) ++e;
     else r.shift();
 
     y.d = r;
     y.e = getBase10Exponent(r, e);
 
     return external ? finalise(y, Ctor.precision, Ctor.rounding) : y;
   };
 
 
   /*
    * Return a string representing the value of this Decimal in base 2, round to `sd` significant
    * digits using rounding mode `rm`.
    *
    * If the optional `sd` argument is present then return binary exponential notation.
    *
    * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    */
   P.toBinary = function (sd, rm) {
     return toStringBinary(this, 2, sd, rm);
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `dp`
    * decimal places using rounding mode `rm` or `rounding` if `rm` is omitted.
    *
    * If `dp` is omitted, return a new Decimal whose value is the value of this Decimal.
    *
    * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    */
   P.toDecimalPlaces = P.toDP = function (dp, rm) {
     var x = this,
       Ctor = x.constructor;
 
     x = new Ctor(x);
     if (dp === void 0) return x;
 
     checkInt32(dp, 0, MAX_DIGITS);
 
     if (rm === void 0) rm = Ctor.rounding;
     else checkInt32(rm, 0, 8);
 
     return finalise(x, dp + x.e + 1, rm);
   };
 
 
   /*
    * Return a string representing the value of this Decimal in exponential notation rounded to
    * `dp` fixed decimal places using rounding mode `rounding`.
    *
    * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    */
   P.toExponential = function (dp, rm) {
     var str,
       x = this,
       Ctor = x.constructor;
 
     if (dp === void 0) {
       str = finiteToString(x, true);
     } else {
       checkInt32(dp, 0, MAX_DIGITS);
 
       if (rm === void 0) rm = Ctor.rounding;
       else checkInt32(rm, 0, 8);
 
       x = finalise(new Ctor(x), dp + 1, rm);
       str = finiteToString(x, true, dp + 1);
     }
 
     return x.isNeg() && !x.isZero() ? '-' + str : str;
   };
 
 
   /*
    * Return a string representing the value of this Decimal in normal (fixed-point) notation to
    * `dp` fixed decimal places and rounded using rounding mode `rm` or `rounding` if `rm` is
    * omitted.
    *
    * As with JavaScript numbers, (-0).toFixed(0) is '0', but e.g. (-0.00001).toFixed(0) is '-0'.
    *
    * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    * (-0).toFixed(0) is '0', but (-0.1).toFixed(0) is '-0'.
    * (-0).toFixed(1) is '0.0', but (-0.01).toFixed(1) is '-0.0'.
    * (-0).toFixed(3) is '0.000'.
    * (-0.5).toFixed(0) is '-0'.
    *
    */
   P.toFixed = function (dp, rm) {
     var str, y,
       x = this,
       Ctor = x.constructor;
 
     if (dp === void 0) {
       str = finiteToString(x);
     } else {
       checkInt32(dp, 0, MAX_DIGITS);
 
       if (rm === void 0) rm = Ctor.rounding;
       else checkInt32(rm, 0, 8);
 
       y = finalise(new Ctor(x), dp + x.e + 1, rm);
       str = finiteToString(y, false, dp + y.e + 1);
     }
 
     // To determine whether to add the minus sign look at the value before it was rounded,
     // i.e. look at `x` rather than `y`.
     return x.isNeg() && !x.isZero() ? '-' + str : str;
   };
 
 
   /*
    * Return an array representing the value of this Decimal as a simple fraction with an integer
    * numerator and an integer denominator.
    *
    * The denominator will be a positive non-zero value less than or equal to the specified maximum
    * denominator. If a maximum denominator is not specified, the denominator will be the lowest
    * value necessary to represent the number exactly.
    *
    * [maxD] {number|string|Decimal} Maximum denominator. Integer >= 1 and < Infinity.
    *
    */
   P.toFraction = function (maxD) {
     var d, d0, d1, d2, e, k, n, n0, n1, pr, q, r,
       x = this,
       xd = x.d,
       Ctor = x.constructor;
 
     if (!xd) return new Ctor(x);
 
     n1 = d0 = new Ctor(1);
     d1 = n0 = new Ctor(0);
 
     d = new Ctor(d1);
     e = d.e = getPrecision(xd) - x.e - 1;
     k = e % LOG_BASE;
     d.d[0] = mathpow(10, k < 0 ? LOG_BASE + k : k);
 
     if (maxD == null) {
 
       // d is 10**e, the minimum max-denominator needed.
       maxD = e > 0 ? d : n1;
     } else {
       n = new Ctor(maxD);
       if (!n.isInt() || n.lt(n1)) throw Error(invalidArgument + n);
       maxD = n.gt(d) ? (e > 0 ? d : n1) : n;
     }
 
     external = false;
     n = new Ctor(digitsToString(xd));
     pr = Ctor.precision;
     Ctor.precision = e = xd.length * LOG_BASE * 2;
 
     for (;;)  {
       q = divide(n, d, 0, 1, 1);
       d2 = d0.plus(q.times(d1));
       if (d2.cmp(maxD) == 1) break;
       d0 = d1;
       d1 = d2;
       d2 = n1;
       n1 = n0.plus(q.times(d2));
       n0 = d2;
       d2 = d;
       d = n.minus(q.times(d2));
       n = d2;
     }
 
     d2 = divide(maxD.minus(d0), d1, 0, 1, 1);
     n0 = n0.plus(d2.times(n1));
     d0 = d0.plus(d2.times(d1));
     n0.s = n1.s = x.s;
 
     // Determine which fraction is closer to x, n0/d0 or n1/d1?
     r = divide(n1, d1, e, 1).minus(x).abs().cmp(divide(n0, d0, e, 1).minus(x).abs()) < 1
         ? [n1, d1] : [n0, d0];
 
     Ctor.precision = pr;
     external = true;
 
     return r;
   };
 
 
   /*
    * Return a string representing the value of this Decimal in base 16, round to `sd` significant
    * digits using rounding mode `rm`.
    *
    * If the optional `sd` argument is present then return binary exponential notation.
    *
    * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    */
   P.toHexadecimal = P.toHex = function (sd, rm) {
     return toStringBinary(this, 16, sd, rm);
   };
 
 
   /*
    * Returns a new Decimal whose value is the nearest multiple of `y` in the direction of rounding
    * mode `rm`, or `Decimal.rounding` if `rm` is omitted, to the value of this Decimal.
    *
    * The return value will always have the same sign as this Decimal, unless either this Decimal
    * or `y` is NaN, in which case the return value will be also be NaN.
    *
    * The return value is not affected by the value of `precision`.
    *
    * y {number|string|Decimal} The magnitude to round to a multiple of.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    * 'toNearest() rounding mode not an integer: {rm}'
    * 'toNearest() rounding mode out of range: {rm}'
    *
    */
   P.toNearest = function (y, rm) {
     var x = this,
       Ctor = x.constructor;
 
     x = new Ctor(x);
 
     if (y == null) {
 
       // If x is not finite, return x.
       if (!x.d) return x;
 
       y = new Ctor(1);
       rm = Ctor.rounding;
     } else {
       y = new Ctor(y);
       if (rm === void 0) {
         rm = Ctor.rounding;
       } else {
         checkInt32(rm, 0, 8);
       }
 
       // If x is not finite, return x if y is not NaN, else NaN.
       if (!x.d) return y.s ? x : y;
 
       // If y is not finite, return Infinity with the sign of x if y is Infinity, else NaN.
       if (!y.d) {
         if (y.s) y.s = x.s;
         return y;
       }
     }
 
     // If y is not zero, calculate the nearest multiple of y to x.
     if (y.d[0]) {
       external = false;
       x = divide(x, y, 0, rm, 1).times(y);
       external = true;
       finalise(x);
 
     // If y is zero, return zero with the sign of x.
     } else {
       y.s = x.s;
       x = y;
     }
 
     return x;
   };
 
 
   /*
    * Return the value of this Decimal converted to a number primitive.
    * Zero keeps its sign.
    *
    */
   P.toNumber = function () {
     return +this;
   };
 
 
   /*
    * Return a string representing the value of this Decimal in base 8, round to `sd` significant
    * digits using rounding mode `rm`.
    *
    * If the optional `sd` argument is present then return binary exponential notation.
    *
    * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    */
   P.toOctal = function (sd, rm) {
     return toStringBinary(this, 8, sd, rm);
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal raised to the power `y`, rounded
    * to `precision` significant digits using rounding mode `rounding`.
    *
    * ECMAScript compliant.
    *
    *   pow(x, NaN)                           = NaN
    *   pow(x, ±0)                            = 1
 
    *   pow(NaN, non-zero)                    = NaN
    *   pow(abs(x) > 1, +Infinity)            = +Infinity
    *   pow(abs(x) > 1, -Infinity)            = +0
    *   pow(abs(x) == 1, ±Infinity)           = NaN
    *   pow(abs(x) < 1, +Infinity)            = +0
    *   pow(abs(x) < 1, -Infinity)            = +Infinity
    *   pow(+Infinity, y > 0)                 = +Infinity
    *   pow(+Infinity, y < 0)                 = +0
    *   pow(-Infinity, odd integer > 0)       = -Infinity
    *   pow(-Infinity, even integer > 0)      = +Infinity
    *   pow(-Infinity, odd integer < 0)       = -0
    *   pow(-Infinity, even integer < 0)      = +0
    *   pow(+0, y > 0)                        = +0
    *   pow(+0, y < 0)                        = +Infinity
    *   pow(-0, odd integer > 0)              = -0
    *   pow(-0, even integer > 0)             = +0
    *   pow(-0, odd integer < 0)              = -Infinity
    *   pow(-0, even integer < 0)             = +Infinity
    *   pow(finite x < 0, finite non-integer) = NaN
    *
    * For non-integer or very large exponents pow(x, y) is calculated using
    *
    *   x^y = exp(y*ln(x))
    *
    * Assuming the first 15 rounding digits are each equally likely to be any digit 0-9, the
    * probability of an incorrectly rounded result
    * P([49]9{14} | [50]0{14}) = 2 * 0.2 * 10^-14 = 4e-15 = 1/2.5e+14
    * i.e. 1 in 250,000,000,000,000
    *
    * If a result is incorrectly rounded the maximum error will be 1 ulp (unit in last place).
    *
    * y {number|string|Decimal} The power to which to raise this Decimal.
    *
    */
   P.toPower = P.pow = function (y) {
     var e, k, pr, r, rm, s,
       x = this,
       Ctor = x.constructor,
       yn = +(y = new Ctor(y));
 
     // Either ±Infinity, NaN or ±0?
     if (!x.d || !y.d || !x.d[0] || !y.d[0]) return new Ctor(mathpow(+x, yn));
 
     x = new Ctor(x);
 
     if (x.eq(1)) return x;
 
     pr = Ctor.precision;
     rm = Ctor.rounding;
 
     if (y.eq(1)) return finalise(x, pr, rm);
 
     // y exponent
     e = mathfloor(y.e / LOG_BASE);
 
     // If y is a small integer use the 'exponentiation by squaring' algorithm.
     if (e >= y.d.length - 1 && (k = yn < 0 ? -yn : yn) <= MAX_SAFE_INTEGER) {
       r = intPow(Ctor, x, k, pr);
       return y.s < 0 ? new Ctor(1).div(r) : finalise(r, pr, rm);
     }
 
     s = x.s;
 
     // if x is negative
     if (s < 0) {
 
       // if y is not an integer
       if (e < y.d.length - 1) return new Ctor(NaN);
 
       // Result is positive if x is negative and the last digit of integer y is even.
       if ((y.d[e] & 1) == 0) s = 1;
 
       // if x.eq(-1)
       if (x.e == 0 && x.d[0] == 1 && x.d.length == 1) {
         x.s = s;
         return x;
       }
     }
 
     // Estimate result exponent.
     // x^y = 10^e,  where e = y * log10(x)
     // log10(x) = log10(x_significand) + x_exponent
     // log10(x_significand) = ln(x_significand) / ln(10)
     k = mathpow(+x, yn);
     e = k == 0 || !isFinite(k)
       ? mathfloor(yn * (Math.log('0.' + digitsToString(x.d)) / Math.LN10 + x.e + 1))
       : new Ctor(k + '').e;
 
     // Exponent estimate may be incorrect e.g. x: 0.999999999999999999, y: 2.29, e: 0, r.e: -1.
 
     // Overflow/underflow?
     if (e > Ctor.maxE + 1 || e < Ctor.minE - 1) return new Ctor(e > 0 ? s / 0 : 0);
 
     external = false;
     Ctor.rounding = x.s = 1;
 
     // Estimate the extra guard digits needed to ensure five correct rounding digits from
     // naturalLogarithm(x). Example of failure without these extra digits (precision: 10):
     // new Decimal(2.32456).pow('2087987436534566.46411')
     // should be 1.162377823e+764914905173815, but is 1.162355823e+764914905173815
     k = Math.min(12, (e + '').length);
 
     // r = x^y = exp(y*ln(x))
     r = naturalExponential(y.times(naturalLogarithm(x, pr + k)), pr);
 
     // r may be Infinity, e.g. (0.9999999999999999).pow(-1e+40)
     if (r.d) {
 
       // Truncate to the required precision plus five rounding digits.
       r = finalise(r, pr + 5, 1);
 
       // If the rounding digits are [49]9999 or [50]0000 increase the precision by 10 and recalculate
       // the result.
       if (checkRoundingDigits(r.d, pr, rm)) {
         e = pr + 10;
 
         // Truncate to the increased precision plus five rounding digits.
         r = finalise(naturalExponential(y.times(naturalLogarithm(x, e + k)), e), e + 5, 1);
 
         // Check for 14 nines from the 2nd rounding digit (the first rounding digit may be 4 or 9).
         if (+digitsToString(r.d).slice(pr + 1, pr + 15) + 1 == 1e14) {
           r = finalise(r, pr + 1, 0);
         }
       }
     }
 
     r.s = s;
     external = true;
     Ctor.rounding = rm;
 
     return finalise(r, pr, rm);
   };
 
 
   /*
    * Return a string representing the value of this Decimal rounded to `sd` significant digits
    * using rounding mode `rounding`.
    *
    * Return exponential notation if `sd` is less than the number of digits necessary to represent
    * the integer part of the value in normal notation.
    *
    * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    */
   P.toPrecision = function (sd, rm) {
     var str,
       x = this,
       Ctor = x.constructor;
 
     if (sd === void 0) {
       str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);
     } else {
       checkInt32(sd, 1, MAX_DIGITS);
 
       if (rm === void 0) rm = Ctor.rounding;
       else checkInt32(rm, 0, 8);
 
       x = finalise(new Ctor(x), sd, rm);
       str = finiteToString(x, sd <= x.e || x.e <= Ctor.toExpNeg, sd);
     }
 
     return x.isNeg() && !x.isZero() ? '-' + str : str;
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `sd`
    * significant digits using rounding mode `rm`, or to `precision` and `rounding` respectively if
    * omitted.
    *
    * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
    * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
    *
    * 'toSD() digits out of range: {sd}'
    * 'toSD() digits not an integer: {sd}'
    * 'toSD() rounding mode not an integer: {rm}'
    * 'toSD() rounding mode out of range: {rm}'
    *
    */
   P.toSignificantDigits = P.toSD = function (sd, rm) {
     var x = this,
       Ctor = x.constructor;
 
     if (sd === void 0) {
       sd = Ctor.precision;
       rm = Ctor.rounding;
     } else {
       checkInt32(sd, 1, MAX_DIGITS);
 
       if (rm === void 0) rm = Ctor.rounding;
       else checkInt32(rm, 0, 8);
     }
 
     return finalise(new Ctor(x), sd, rm);
   };
 
 
   /*
    * Return a string representing the value of this Decimal.
    *
    * Return exponential notation if this Decimal has a positive exponent equal to or greater than
    * `toExpPos`, or a negative exponent equal to or less than `toExpNeg`.
    *
    */
   P.toString = function () {
     var x = this,
       Ctor = x.constructor,
       str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);
 
     return x.isNeg() && !x.isZero() ? '-' + str : str;
   };
 
 
   /*
    * Return a new Decimal whose value is the value of this Decimal truncated to a whole number.
    *
    */
   P.truncated = P.trunc = function () {
     return finalise(new this.constructor(this), this.e + 1, 1);
   };
 
 
   /*
    * Return a string representing the value of this Decimal.
    * Unlike `toString`, negative zero will include the minus sign.
    *
    */
   P.valueOf = P.toJSON = function () {
     var x = this,
       Ctor = x.constructor,
       str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);
 
     return x.isNeg() ? '-' + str : str;
   };
 
 
   // Helper functions for Decimal.prototype (P) and/or Decimal methods, and their callers.
 
 
   /*
    *  digitsToString           P.cubeRoot, P.logarithm, P.squareRoot, P.toFraction, P.toPower,
    *                           finiteToString, naturalExponential, naturalLogarithm
    *  checkInt32               P.toDecimalPlaces, P.toExponential, P.toFixed, P.toNearest,
    *                           P.toPrecision, P.toSignificantDigits, toStringBinary, random
    *  checkRoundingDigits      P.logarithm, P.toPower, naturalExponential, naturalLogarithm
    *  convertBase              toStringBinary, parseOther
    *  cos                      P.cos
    *  divide                   P.atanh, P.cubeRoot, P.dividedBy, P.dividedToIntegerBy,
    *                           P.logarithm, P.modulo, P.squareRoot, P.tan, P.tanh, P.toFraction,
    *                           P.toNearest, toStringBinary, naturalExponential, naturalLogarithm,
    *                           taylorSeries, atan2, parseOther
    *  finalise                 P.absoluteValue, P.atan, P.atanh, P.ceil, P.cos, P.cosh,
    *                           P.cubeRoot, P.dividedToIntegerBy, P.floor, P.logarithm, P.minus,
    *                           P.modulo, P.negated, P.plus, P.round, P.sin, P.sinh, P.squareRoot,
    *                           P.tan, P.times, P.toDecimalPlaces, P.toExponential, P.toFixed,
    *                           P.toNearest, P.toPower, P.toPrecision, P.toSignificantDigits,
    *                           P.truncated, divide, getLn10, getPi, naturalExponential,
    *                           naturalLogarithm, ceil, floor, round, trunc
    *  finiteToString           P.toExponential, P.toFixed, P.toPrecision, P.toString, P.valueOf,
    *                           toStringBinary
    *  getBase10Exponent        P.minus, P.plus, P.times, parseOther
    *  getLn10                  P.logarithm, naturalLogarithm
    *  getPi                    P.acos, P.asin, P.atan, toLessThanHalfPi, atan2
    *  getPrecision             P.precision, P.toFraction
    *  getZeroString            digitsToString, finiteToString
    *  intPow                   P.toPower, parseOther
    *  isOdd                    toLessThanHalfPi
    *  maxOrMin                 max, min
    *  naturalExponential       P.naturalExponential, P.toPower
    *  naturalLogarithm         P.acosh, P.asinh, P.atanh, P.logarithm, P.naturalLogarithm,
    *                           P.toPower, naturalExponential
    *  nonFiniteToString        finiteToString, toStringBinary
    *  parseDecimal             Decimal
    *  parseOther               Decimal
    *  sin                      P.sin
    *  taylorSeries             P.cosh, P.sinh, cos, sin
    *  toLessThanHalfPi         P.cos, P.sin
    *  toStringBinary           P.toBinary, P.toHexadecimal, P.toOctal
    *  truncate                 intPow
    *
    *  Throws:                  P.logarithm, P.precision, P.toFraction, checkInt32, getLn10, getPi,
    *                           naturalLogarithm, config, parseOther, random, Decimal
    */
 
 
   function digitsToString(d) {
     var i, k, ws,
       indexOfLastWord = d.length - 1,
       str = '',
       w = d[0];
 
     if (indexOfLastWord > 0) {
       str += w;
       for (i = 1; i < indexOfLastWord; i++) {
         ws = d[i] + '';
         k = LOG_BASE - ws.length;
         if (k) str += getZeroString(k);
         str += ws;
       }
 
       w = d[i];
       ws = w + '';
       k = LOG_BASE - ws.length;
       if (k) str += getZeroString(k);
     } else if (w === 0) {
       return '0';
     }
 
     // Remove trailing zeros of last w.
     for (; w % 10 === 0;) w /= 10;
 
     return str + w;
   }
 
 
   function checkInt32(i, min, max) {
     if (i !== ~~i || i < min || i > max) {
       throw Error(invalidArgument + i);
     }
   }
 
 
   /*
    * Check 5 rounding digits if `repeating` is null, 4 otherwise.
    * `repeating == null` if caller is `log` or `pow`,
    * `repeating != null` if caller is `naturalLogarithm` or `naturalExponential`.
    */
   function checkRoundingDigits(d, i, rm, repeating) {
     var di, k, r, rd;
 
     // Get the length of the first word of the array d.
     for (k = d[0]; k >= 10; k /= 10) --i;
 
     // Is the rounding digit in the first word of d?
     if (--i < 0) {
       i += LOG_BASE;
       di = 0;
     } else {
       di = Math.ceil((i + 1) / LOG_BASE);
       i %= LOG_BASE;
     }
 
     // i is the index (0 - 6) of the rounding digit.
     // E.g. if within the word 3487563 the first rounding digit is 5,
     // then i = 4, k = 1000, rd = 3487563 % 1000 = 563
     k = mathpow(10, LOG_BASE - i);
     rd = d[di] % k | 0;
 
     if (repeating == null) {
       if (i < 3) {
         if (i == 0) rd = rd / 100 | 0;
         else if (i == 1) rd = rd / 10 | 0;
         r = rm < 4 && rd == 99999 || rm > 3 && rd == 49999 || rd == 50000 || rd == 0;
       } else {
         r = (rm < 4 && rd + 1 == k || rm > 3 && rd + 1 == k / 2) &&
           (d[di + 1] / k / 100 | 0) == mathpow(10, i - 2) - 1 ||
             (rd == k / 2 || rd == 0) && (d[di + 1] / k / 100 | 0) == 0;
       }
     } else {
       if (i < 4) {
         if (i == 0) rd = rd / 1000 | 0;
         else if (i == 1) rd = rd / 100 | 0;
         else if (i == 2) rd = rd / 10 | 0;
         r = (repeating || rm < 4) && rd == 9999 || !repeating && rm > 3 && rd == 4999;
       } else {
         r = ((repeating || rm < 4) && rd + 1 == k ||
         (!repeating && rm > 3) && rd + 1 == k / 2) &&
           (d[di + 1] / k / 1000 | 0) == mathpow(10, i - 3) - 1;
       }
     }
 
     return r;
   }
 
 
   // Convert string of `baseIn` to an array of numbers of `baseOut`.
   // Eg. convertBase('255', 10, 16) returns [15, 15].
   // Eg. convertBase('ff', 16, 10) returns [2, 5, 5].
   function convertBase(str, baseIn, baseOut) {
     var j,
       arr = [0],
       arrL,
       i = 0,
       strL = str.length;
 
     for (; i < strL;) {
       for (arrL = arr.length; arrL--;) arr[arrL] *= baseIn;
       arr[0] += NUMERALS.indexOf(str.charAt(i++));
       for (j = 0; j < arr.length; j++) {
         if (arr[j] > baseOut - 1) {
           if (arr[j + 1] === void 0) arr[j + 1] = 0;
           arr[j + 1] += arr[j] / baseOut | 0;
           arr[j] %= baseOut;
         }
       }
     }
 
     return arr.reverse();
   }
 
 
   /*
    * cos(x) = 1 - x^2/2! + x^4/4! - ...
    * |x| < pi/2
    *
    */
   function cosine(Ctor, x) {
     var k, len, y;
 
     if (x.isZero()) return x;
 
     // Argument reduction: cos(4x) = 8*(cos^4(x) - cos^2(x)) + 1
     // i.e. cos(x) = 8*(cos^4(x/4) - cos^2(x/4)) + 1
 
     // Estimate the optimum number of times to use the argument reduction.
     len = x.d.length;
     if (len < 32) {
       k = Math.ceil(len / 3);
       y = (1 / tinyPow(4, k)).toString();
     } else {
       k = 16;
       y = '2.3283064365386962890625e-10';
     }
 
     Ctor.precision += k;
 
     x = taylorSeries(Ctor, 1, x.times(y), new Ctor(1));
 
     // Reverse argument reduction
     for (var i = k; i--;) {
       var cos2x = x.times(x);
       x = cos2x.times(cos2x).minus(cos2x).times(8).plus(1);
     }
 
     Ctor.precision -= k;
 
     return x;
   }
 
 
   /*
    * Perform division in the specified base.
    */
   var divide = (function () {
 
     // Assumes non-zero x and k, and hence non-zero result.
     function multiplyInteger(x, k, base) {
       var temp,
         carry = 0,
         i = x.length;
 
       for (x = x.slice(); i--;) {
         temp = x[i] * k + carry;
         x[i] = temp % base | 0;
         carry = temp / base | 0;
       }
 
       if (carry) x.unshift(carry);
 
       return x;
     }
 
     function compare(a, b, aL, bL) {
       var i, r;
 
       if (aL != bL) {
         r = aL > bL ? 1 : -1;
       } else {
         for (i = r = 0; i < aL; i++) {
           if (a[i] != b[i]) {
             r = a[i] > b[i] ? 1 : -1;
             break;
           }
         }
       }
 
       return r;
     }
 
     function subtract(a, b, aL, base) {
       var i = 0;
 
       // Subtract b from a.
       for (; aL--;) {
         a[aL] -= i;
         i = a[aL] < b[aL] ? 1 : 0;
         a[aL] = i * base + a[aL] - b[aL];
       }
 
       // Remove leading zeros.
       for (; !a[0] && a.length > 1;) a.shift();
     }
 
     return function (x, y, pr, rm, dp, base) {
       var cmp, e, i, k, logBase, more, prod, prodL, q, qd, rem, remL, rem0, sd, t, xi, xL, yd0,
         yL, yz,
         Ctor = x.constructor,
         sign = x.s == y.s ? 1 : -1,
         xd = x.d,
         yd = y.d;
 
       // Either NaN, Infinity or 0?
       if (!xd || !xd[0] || !yd || !yd[0]) {
 
         return new Ctor(// Return NaN if either NaN, or both Infinity or 0.
           !x.s || !y.s || (xd ? yd && xd[0] == yd[0] : !yd) ? NaN :
 
           // Return ±0 if x is 0 or y is ±Infinity, or return ±Infinity as y is 0.
           xd && xd[0] == 0 || !yd ? sign * 0 : sign / 0);
       }
 
       if (base) {
         logBase = 1;
         e = x.e - y.e;
       } else {
         base = BASE;
         logBase = LOG_BASE;
         e = mathfloor(x.e / logBase) - mathfloor(y.e / logBase);
       }
 
       yL = yd.length;
       xL = xd.length;
       q = new Ctor(sign);
       qd = q.d = [];
 
       // Result exponent may be one less than e.
       // The digit array of a Decimal from toStringBinary may have trailing zeros.
       for (i = 0; yd[i] == (xd[i] || 0); i++);
 
       if (yd[i] > (xd[i] || 0)) e--;
 
       if (pr == null) {
         sd = pr = Ctor.precision;
         rm = Ctor.rounding;
       } else if (dp) {
         sd = pr + (x.e - y.e) + 1;
       } else {
         sd = pr;
       }
 
       if (sd < 0) {
         qd.push(1);
         more = true;
       } else {
 
         // Convert precision in number of base 10 digits to base 1e7 digits.
         sd = sd / logBase + 2 | 0;
         i = 0;
 
         // divisor < 1e7
         if (yL == 1) {
           k = 0;
           yd = yd[0];
           sd++;
 
           // k is the carry.
           for (; (i < xL || k) && sd--; i++) {
             t = k * base + (xd[i] || 0);
             qd[i] = t / yd | 0;
             k = t % yd | 0;
           }
 
           more = k || i < xL;
 
         // divisor >= 1e7
         } else {
 
           // Normalise xd and yd so highest order digit of yd is >= base/2
           k = base / (yd[0] + 1) | 0;
 
           if (k > 1) {
             yd = multiplyInteger(yd, k, base);
             xd = multiplyInteger(xd, k, base);
             yL = yd.length;
             xL = xd.length;
           }
 
           xi = yL;
           rem = xd.slice(0, yL);
           remL = rem.length;
 
           // Add zeros to make remainder as long as divisor.
           for (; remL < yL;) rem[remL++] = 0;
 
           yz = yd.slice();
           yz.unshift(0);
           yd0 = yd[0];
 
           if (yd[1] >= base / 2) ++yd0;
 
           do {
             k = 0;
 
             // Compare divisor and remainder.
             cmp = compare(yd, rem, yL, remL);
 
             // If divisor < remainder.
             if (cmp < 0) {
 
               // Calculate trial digit, k.
               rem0 = rem[0];
               if (yL != remL) rem0 = rem0 * base + (rem[1] || 0);
 
               // k will be how many times the divisor goes into the current remainder.
               k = rem0 / yd0 | 0;
 
               //  Algorithm:
               //  1. product = divisor * trial digit (k)
               //  2. if product > remainder: product -= divisor, k--
               //  3. remainder -= product
               //  4. if product was < remainder at 2:
               //    5. compare new remainder and divisor
               //    6. If remainder > divisor: remainder -= divisor, k++
 
               if (k > 1) {
                 if (k >= base) k = base - 1;
 
                 // product = divisor * trial digit.
                 prod = multiplyInteger(yd, k, base);
                 prodL = prod.length;
                 remL = rem.length;
 
                 // Compare product and remainder.
                 cmp = compare(prod, rem, prodL, remL);
 
                 // product > remainder.
                 if (cmp == 1) {
                   k--;
 
                   // Subtract divisor from product.
                   subtract(prod, yL < prodL ? yz : yd, prodL, base);
                 }
               } else {
 
                 // cmp is -1.
                 // If k is 0, there is no need to compare yd and rem again below, so change cmp to 1
                 // to avoid it. If k is 1 there is a need to compare yd and rem again below.
                 if (k == 0) cmp = k = 1;
                 prod = yd.slice();
               }
 
               prodL = prod.length;
               if (prodL < remL) prod.unshift(0);
 
               // Subtract product from remainder.
               subtract(rem, prod, remL, base);
 
               // If product was < previous remainder.
               if (cmp == -1) {
                 remL = rem.length;
 
                 // Compare divisor and new remainder.
                 cmp = compare(yd, rem, yL, remL);
 
                 // If divisor < new remainder, subtract divisor from remainder.
                 if (cmp < 1) {
                   k++;
 
                   // Subtract divisor from remainder.
                   subtract(rem, yL < remL ? yz : yd, remL, base);
                 }
               }
 
               remL = rem.length;
             } else if (cmp === 0) {
               k++;
               rem = [0];
             }    // if cmp === 1, k will be 0
 
             // Add the next digit, k, to the result array.
             qd[i++] = k;
 
             // Update the remainder.
             if (cmp && rem[0]) {
               rem[remL++] = xd[xi] || 0;
             } else {
               rem = [xd[xi]];
               remL = 1;
             }
 
           } while ((xi++ < xL || rem[0] !== void 0) && sd--);
 
           more = rem[0] !== void 0;
         }
 
         // Leading zero?
         if (!qd[0]) qd.shift();
       }
 
       // logBase is 1 when divide is being used for base conversion.
       if (logBase == 1) {
         q.e = e;
         inexact = more;
       } else {
 
         // To calculate q.e, first get the number of digits of qd[0].
         for (i = 1, k = qd[0]; k >= 10; k /= 10) i++;
         q.e = i + e * logBase - 1;
 
         finalise(q, dp ? pr + q.e + 1 : pr, rm, more);
       }
 
       return q;
     };
   })();
 
 
   /*
    * Round `x` to `sd` significant digits using rounding mode `rm`.
    * Check for over/under-flow.
    */
    function finalise(x, sd, rm, isTruncated) {
     var digits, i, j, k, rd, roundUp, w, xd, xdi,
       Ctor = x.constructor;
 
     // Don't round if sd is null or undefined.
     out: if (sd != null) {
       xd = x.d;
 
       // Infinity/NaN.
       if (!xd) return x;
 
       // rd: the rounding digit, i.e. the digit after the digit that may be rounded up.
       // w: the word of xd containing rd, a base 1e7 number.
       // xdi: the index of w within xd.
       // digits: the number of digits of w.
       // i: what would be the index of rd within w if all the numbers were 7 digits long (i.e. if
       // they had leading zeros)
       // j: if > 0, the actual index of rd within w (if < 0, rd is a leading zero).
 
       // Get the length of the first word of the digits array xd.
       for (digits = 1, k = xd[0]; k >= 10; k /= 10) digits++;
       i = sd - digits;
 
       // Is the rounding digit in the first word of xd?
       if (i < 0) {
         i += LOG_BASE;
         j = sd;
         w = xd[xdi = 0];
 
         // Get the rounding digit at index j of w.
         rd = w / mathpow(10, digits - j - 1) % 10 | 0;
       } else {
         xdi = Math.ceil((i + 1) / LOG_BASE);
         k = xd.length;
         if (xdi >= k) {
           if (isTruncated) {
 
             // Needed by `naturalExponential`, `naturalLogarithm` and `squareRoot`.
             for (; k++ <= xdi;) xd.push(0);
             w = rd = 0;
             digits = 1;
             i %= LOG_BASE;
             j = i - LOG_BASE + 1;
           } else {
             break out;
           }
         } else {
           w = k = xd[xdi];
 
           // Get the number of digits of w.
           for (digits = 1; k >= 10; k /= 10) digits++;
 
           // Get the index of rd within w.
           i %= LOG_BASE;
 
           // Get the index of rd within w, adjusted for leading zeros.
           // The number of leading zeros of w is given by LOG_BASE - digits.
           j = i - LOG_BASE + digits;
 
           // Get the rounding digit at index j of w.
           rd = j < 0 ? 0 : w / mathpow(10, digits - j - 1) % 10 | 0;
         }
       }
 
       // Are there any non-zero digits after the rounding digit?
       isTruncated = isTruncated || sd < 0 ||
         xd[xdi + 1] !== void 0 || (j < 0 ? w : w % mathpow(10, digits - j - 1));
 
       // The expression `w % mathpow(10, digits - j - 1)` returns all the digits of w to the right
       // of the digit at (left-to-right) index j, e.g. if w is 908714 and j is 2, the expression
       // will give 714.
 
       roundUp = rm < 4
         ? (rd || isTruncated) && (rm == 0 || rm == (x.s < 0 ? 3 : 2))
         : rd > 5 || rd == 5 && (rm == 4 || isTruncated || rm == 6 &&
 
           // Check whether the digit to the left of the rounding digit is odd.
           ((i > 0 ? j > 0 ? w / mathpow(10, digits - j) : 0 : xd[xdi - 1]) % 10) & 1 ||
             rm == (x.s < 0 ? 8 : 7));
 
       if (sd < 1 || !xd[0]) {
         xd.length = 0;
         if (roundUp) {
 
           // Convert sd to decimal places.
           sd -= x.e + 1;
 
           // 1, 0.1, 0.01, 0.001, 0.0001 etc.
           xd[0] = mathpow(10, (LOG_BASE - sd % LOG_BASE) % LOG_BASE);
           x.e = -sd || 0;
         } else {
 
           // Zero.
           xd[0] = x.e = 0;
         }
 
         return x;
       }
 
       // Remove excess digits.
       if (i == 0) {
         xd.length = xdi;
         k = 1;
         xdi--;
       } else {
         xd.length = xdi + 1;
         k = mathpow(10, LOG_BASE - i);
 
         // E.g. 56700 becomes 56000 if 7 is the rounding digit.
         // j > 0 means i > number of leading zeros of w.
         xd[xdi] = j > 0 ? (w / mathpow(10, digits - j) % mathpow(10, j) | 0) * k : 0;
       }
 
       if (roundUp) {
         for (;;) {
 
           // Is the digit to be rounded up in the first word of xd?
           if (xdi == 0) {
 
             // i will be the length of xd[0] before k is added.
             for (i = 1, j = xd[0]; j >= 10; j /= 10) i++;
             j = xd[0] += k;
             for (k = 1; j >= 10; j /= 10) k++;
 
             // if i != k the length has increased.
             if (i != k) {
               x.e++;
               if (xd[0] == BASE) xd[0] = 1;
             }
 
             break;
           } else {
             xd[xdi] += k;
             if (xd[xdi] != BASE) break;
             xd[xdi--] = 0;
             k = 1;
           }
         }
       }
 
       // Remove trailing zeros.
       for (i = xd.length; xd[--i] === 0;) xd.pop();
     }
 
     if (external) {
 
       // Overflow?
       if (x.e > Ctor.maxE) {
 
         // Infinity.
         x.d = null;
         x.e = NaN;
 
       // Underflow?
       } else if (x.e < Ctor.minE) {
 
         // Zero.
         x.e = 0;
         x.d = [0];
         // Ctor.underflow = true;
       } // else Ctor.underflow = false;
     }
 
     return x;
   }
 
 
   function finiteToString(x, isExp, sd) {
     if (!x.isFinite()) return nonFiniteToString(x);
     var k,
       e = x.e,
       str = digitsToString(x.d),
       len = str.length;
 
     if (isExp) {
       if (sd && (k = sd - len) > 0) {
         str = str.charAt(0) + '.' + str.slice(1) + getZeroString(k);
       } else if (len > 1) {
         str = str.charAt(0) + '.' + str.slice(1);
       }
 
       str = str + (x.e < 0 ? 'e' : 'e+') + x.e;
     } else if (e < 0) {
       str = '0.' + getZeroString(-e - 1) + str;
       if (sd && (k = sd - len) > 0) str += getZeroString(k);
     } else if (e >= len) {
       str += getZeroString(e + 1 - len);
       if (sd && (k = sd - e - 1) > 0) str = str + '.' + getZeroString(k);
     } else {
       if ((k = e + 1) < len) str = str.slice(0, k) + '.' + str.slice(k);
       if (sd && (k = sd - len) > 0) {
         if (e + 1 === len) str += '.';
         str += getZeroString(k);
       }
     }
 
     return str;
   }
 
 
   // Calculate the base 10 exponent from the base 1e7 exponent.
   function getBase10Exponent(digits, e) {
     var w = digits[0];
 
     // Add the number of digits of the first word of the digits array.
     for ( e *= LOG_BASE; w >= 10; w /= 10) e++;
     return e;
   }
 
 
   function getLn10(Ctor, sd, pr) {
     if (sd > LN10_PRECISION) {
 
       // Reset global state in case the exception is caught.
       external = true;
       if (pr) Ctor.precision = pr;
       throw Error(precisionLimitExceeded);
     }
     return finalise(new Ctor(LN10), sd, 1, true);
   }
 
 
   function getPi(Ctor, sd, rm) {
     if (sd > PI_PRECISION) throw Error(precisionLimitExceeded);
     return finalise(new Ctor(PI), sd, rm, true);
   }
 
 
   function getPrecision(digits) {
     var w = digits.length - 1,
       len = w * LOG_BASE + 1;
 
     w = digits[w];
 
     // If non-zero...
     if (w) {
 
       // Subtract the number of trailing zeros of the last word.
       for (; w % 10 == 0; w /= 10) len--;
 
       // Add the number of digits of the first word.
       for (w = digits[0]; w >= 10; w /= 10) len++;
     }
 
     return len;
   }
 
 
   function getZeroString(k) {
     var zs = '';
     for (; k--;) zs += '0';
     return zs;
   }
 
 
   /*
    * Return a new Decimal whose value is the value of Decimal `x` to the power `n`, where `n` is an
    * integer of type number.
    *
    * Implements 'exponentiation by squaring'. Called by `pow` and `parseOther`.
    *
    */
   function intPow(Ctor, x, n, pr) {
     var isTruncated,
       r = new Ctor(1),
 
       // Max n of 9007199254740991 takes 53 loop iterations.
       // Maximum digits array length; leaves [28, 34] guard digits.
       k = Math.ceil(pr / LOG_BASE + 4);
 
     external = false;
 
     for (;;) {
       if (n % 2) {
         r = r.times(x);
         if (truncate(r.d, k)) isTruncated = true;
       }
 
       n = mathfloor(n / 2);
       if (n === 0) {
 
         // To ensure correct rounding when r.d is truncated, increment the last word if it is zero.
         n = r.d.length - 1;
         if (isTruncated && r.d[n] === 0) ++r.d[n];
         break;
       }
 
       x = x.times(x);
       truncate(x.d, k);
     }
 
     external = true;
 
     return r;
   }
 
 
   function isOdd(n) {
     return n.d[n.d.length - 1] & 1;
   }
 
 
   /*
    * Handle `max` and `min`. `ltgt` is 'lt' or 'gt'.
    */
   function maxOrMin(Ctor, args, ltgt) {
     var y,
       x = new Ctor(args[0]),
       i = 0;
 
     for (; ++i < args.length;) {
       y = new Ctor(args[i]);
       if (!y.s) {
         x = y;
         break;
       } else if (x[ltgt](y)) {
         x = y;
       }
     }
 
     return x;
   }
 
 
   /*
    * Return a new Decimal whose value is the natural exponential of `x` rounded to `sd` significant
    * digits.
    *
    * Taylor/Maclaurin series.
    *
    * exp(x) = x^0/0! + x^1/1! + x^2/2! + x^3/3! + ...
    *
    * Argument reduction:
    *   Repeat x = x / 32, k += 5, until |x| < 0.1
    *   exp(x) = exp(x / 2^k)^(2^k)
    *
    * Previously, the argument was initially reduced by
    * exp(x) = exp(r) * 10^k  where r = x - k * ln10, k = floor(x / ln10)
    * to first put r in the range [0, ln10], before dividing by 32 until |x| < 0.1, but this was
    * found to be slower than just dividing repeatedly by 32 as above.
    *
    * Max integer argument: exp('20723265836946413') = 6.3e+9000000000000000
    * Min integer argument: exp('-20723265836946411') = 1.2e-9000000000000000
    * (Math object integer min/max: Math.exp(709) = 8.2e+307, Math.exp(-745) = 5e-324)
    *
    *  exp(Infinity)  = Infinity
    *  exp(-Infinity) = 0
    *  exp(NaN)       = NaN
    *  exp(±0)        = 1
    *
    *  exp(x) is non-terminating for any finite, non-zero x.
    *
    *  The result will always be correctly rounded.
    *
    */
   function naturalExponential(x, sd) {
     var denominator, guard, j, pow, sum, t, wpr,
       rep = 0,
       i = 0,
       k = 0,
       Ctor = x.constructor,
       rm = Ctor.rounding,
       pr = Ctor.precision;
 
     // 0/NaN/Infinity?
     if (!x.d || !x.d[0] || x.e > 17) {
 
       return new Ctor(x.d
         ? !x.d[0] ? 1 : x.s < 0 ? 0 : 1 / 0
         : x.s ? x.s < 0 ? 0 : x : 0 / 0);
     }
 
     if (sd == null) {
       external = false;
       wpr = pr;
     } else {
       wpr = sd;
     }
 
     t = new Ctor(0.03125);
 
     // while abs(x) >= 0.1
     while (x.e > -2) {
 
       // x = x / 2^5
       x = x.times(t);
       k += 5;
     }
 
     // Use 2 * log10(2^k) + 5 (empirically derived) to estimate the increase in precision
     // necessary to ensure the first 4 rounding digits are correct.
     guard = Math.log(mathpow(2, k)) / Math.LN10 * 2 + 5 | 0;
     wpr += guard;
     denominator = pow = sum = new Ctor(1);
     Ctor.precision = wpr;
 
     for (;;) {
       pow = finalise(pow.times(x), wpr, 1);
       denominator = denominator.times(++i);
       t = sum.plus(divide(pow, denominator, wpr, 1));
 
       if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) {
         j = k;
         while (j--) sum = finalise(sum.times(sum), wpr, 1);
 
         // Check to see if the first 4 rounding digits are [49]999.
         // If so, repeat the summation with a higher precision, otherwise
         // e.g. with precision: 18, rounding: 1
         // exp(18.404272462595034083567793919843761) = 98372560.1229999999 (should be 98372560.123)
         // `wpr - guard` is the index of first rounding digit.
         if (sd == null) {
 
           if (rep < 3 && checkRoundingDigits(sum.d, wpr - guard, rm, rep)) {
             Ctor.precision = wpr += 10;
             denominator = pow = t = new Ctor(1);
             i = 0;
             rep++;
           } else {
             return finalise(sum, Ctor.precision = pr, rm, external = true);
           }
         } else {
           Ctor.precision = pr;
           return sum;
         }
       }
 
       sum = t;
     }
   }
 
 
   /*
    * Return a new Decimal whose value is the natural logarithm of `x` rounded to `sd` significant
    * digits.
    *
    *  ln(-n)        = NaN
    *  ln(0)         = -Infinity
    *  ln(-0)        = -Infinity
    *  ln(1)         = 0
    *  ln(Infinity)  = Infinity
    *  ln(-Infinity) = NaN
    *  ln(NaN)       = NaN
    *
    *  ln(n) (n != 1) is non-terminating.
    *
    */
   function naturalLogarithm(y, sd) {
     var c, c0, denominator, e, numerator, rep, sum, t, wpr, x1, x2,
       n = 1,
       guard = 10,
       x = y,
       xd = x.d,
       Ctor = x.constructor,
       rm = Ctor.rounding,
       pr = Ctor.precision;
 
     // Is x negative or Infinity, NaN, 0 or 1?
     if (x.s < 0 || !xd || !xd[0] || !x.e && xd[0] == 1 && xd.length == 1) {
       return new Ctor(xd && !xd[0] ? -1 / 0 : x.s != 1 ? NaN : xd ? 0 : x);
     }
 
     if (sd == null) {
       external = false;
       wpr = pr;
     } else {
       wpr = sd;
     }
 
     Ctor.precision = wpr += guard;
     c = digitsToString(xd);
     c0 = c.charAt(0);
 
     if (Math.abs(e = x.e) < 1.5e15) {
 
       // Argument reduction.
       // The series converges faster the closer the argument is to 1, so using
       // ln(a^b) = b * ln(a),   ln(a) = ln(a^b) / b
       // multiply the argument by itself until the leading digits of the significand are 7, 8, 9,
       // 10, 11, 12 or 13, recording the number of multiplications so the sum of the series can
       // later be divided by this number, then separate out the power of 10 using
       // ln(a*10^b) = ln(a) + b*ln(10).
 
       // max n is 21 (gives 0.9, 1.0 or 1.1) (9e15 / 21 = 4.2e14).
       //while (c0 < 9 && c0 != 1 || c0 == 1 && c.charAt(1) > 1) {
       // max n is 6 (gives 0.7 - 1.3)
       while (c0 < 7 && c0 != 1 || c0 == 1 && c.charAt(1) > 3) {
         x = x.times(y);
         c = digitsToString(x.d);
         c0 = c.charAt(0);
         n++;
       }
 
       e = x.e;
 
       if (c0 > 1) {
         x = new Ctor('0.' + c);
         e++;
       } else {
         x = new Ctor(c0 + '.' + c.slice(1));
       }
     } else {
 
       // The argument reduction method above may result in overflow if the argument y is a massive
       // number with exponent >= 1500000000000000 (9e15 / 6 = 1.5e15), so instead recall this
       // function using ln(x*10^e) = ln(x) + e*ln(10).
       t = getLn10(Ctor, wpr + 2, pr).times(e + '');
       x = naturalLogarithm(new Ctor(c0 + '.' + c.slice(1)), wpr - guard).plus(t);
       Ctor.precision = pr;
 
       return sd == null ? finalise(x, pr, rm, external = true) : x;
     }
 
     // x1 is x reduced to a value near 1.
     x1 = x;
 
     // Taylor series.
     // ln(y) = ln((1 + x)/(1 - x)) = 2(x + x^3/3 + x^5/5 + x^7/7 + ...)
     // where x = (y - 1)/(y + 1)    (|x| < 1)
     sum = numerator = x = divide(x.minus(1), x.plus(1), wpr, 1);
     x2 = finalise(x.times(x), wpr, 1);
     denominator = 3;
 
     for (;;) {
       numerator = finalise(numerator.times(x2), wpr, 1);
       t = sum.plus(divide(numerator, new Ctor(denominator), wpr, 1));
 
       if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) {
         sum = sum.times(2);
 
         // Reverse the argument reduction. Check that e is not 0 because, besides preventing an
         // unnecessary calculation, -0 + 0 = +0 and to ensure correct rounding -0 needs to stay -0.
         if (e !== 0) sum = sum.plus(getLn10(Ctor, wpr + 2, pr).times(e + ''));
         sum = divide(sum, new Ctor(n), wpr, 1);
 
         // Is rm > 3 and the first 4 rounding digits 4999, or rm < 4 (or the summation has
         // been repeated previously) and the first 4 rounding digits 9999?
         // If so, restart the summation with a higher precision, otherwise
         // e.g. with precision: 12, rounding: 1
         // ln(135520028.6126091714265381533) = 18.7246299999 when it should be 18.72463.
         // `wpr - guard` is the index of first rounding digit.
         if (sd == null) {
           if (checkRoundingDigits(sum.d, wpr - guard, rm, rep)) {
             Ctor.precision = wpr += guard;
             t = numerator = x = divide(x1.minus(1), x1.plus(1), wpr, 1);
             x2 = finalise(x.times(x), wpr, 1);
             denominator = rep = 1;
           } else {
             return finalise(sum, Ctor.precision = pr, rm, external = true);
           }
         } else {
           Ctor.precision = pr;
           return sum;
         }
       }
 
       sum = t;
       denominator += 2;
     }
   }
 
 
   // ±Infinity, NaN.
   function nonFiniteToString(x) {
     // Unsigned.
     return String(x.s * x.s / 0);
   }
 
 
   /*
    * Parse the value of a new Decimal `x` from string `str`.
    */
   function parseDecimal(x, str) {
     var e, i, len;
 
     // Decimal point?
     if ((e = str.indexOf('.')) > -1) str = str.replace('.', '');
 
     // Exponential form?
     if ((i = str.search(/e/i)) > 0) {
 
       // Determine exponent.
       if (e < 0) e = i;
       e += +str.slice(i + 1);
       str = str.substring(0, i);
     } else if (e < 0) {
 
       // Integer.
       e = str.length;
     }
 
     // Determine leading zeros.
     for (i = 0; str.charCodeAt(i) === 48; i++);
 
     // Determine trailing zeros.
     for (len = str.length; str.charCodeAt(len - 1) === 48; --len);
     str = str.slice(i, len);
 
     if (str) {
       len -= i;
       x.e = e = e - i - 1;
       x.d = [];
 
       // Transform base
 
       // e is the base 10 exponent.
       // i is where to slice str to get the first word of the digits array.
       i = (e + 1) % LOG_BASE;
       if (e < 0) i += LOG_BASE;
 
       if (i < len) {
         if (i) x.d.push(+str.slice(0, i));
         for (len -= LOG_BASE; i < len;) x.d.push(+str.slice(i, i += LOG_BASE));
         str = str.slice(i);
         i = LOG_BASE - str.length;
       } else {
         i -= len;
       }
 
       for (; i--;) str += '0';
       x.d.push(+str);
 
       if (external) {
 
         // Overflow?
         if (x.e > x.constructor.maxE) {
 
           // Infinity.
           x.d = null;
           x.e = NaN;
 
         // Underflow?
         } else if (x.e < x.constructor.minE) {
 
           // Zero.
           x.e = 0;
           x.d = [0];
           // x.constructor.underflow = true;
         } // else x.constructor.underflow = false;
       }
     } else {
 
       // Zero.
       x.e = 0;
       x.d = [0];
     }
 
     return x;
   }
 
 
   /*
    * Parse the value of a new Decimal `x` from a string `str`, which is not a decimal value.
    */
   function parseOther(x, str) {
     var base, Ctor, divisor, i, isFloat, len, p, xd, xe;
 
     if (str.indexOf('_') > -1) {
       str = str.replace(/(\d)_(?=\d)/g, '$1');
       if (isDecimal.test(str)) return parseDecimal(x, str);
     } else if (str === 'Infinity' || str === 'NaN') {
       if (!+str) x.s = NaN;
       x.e = NaN;
       x.d = null;
       return x;
     }
 
     if (isHex.test(str))  {
       base = 16;
       str = str.toLowerCase();
     } else if (isBinary.test(str))  {
       base = 2;
     } else if (isOctal.test(str))  {
       base = 8;
     } else {
       throw Error(invalidArgument + str);
     }
 
     // Is there a binary exponent part?
     i = str.search(/p/i);
 
     if (i > 0) {
       p = +str.slice(i + 1);
       str = str.substring(2, i);
     } else {
       str = str.slice(2);
     }
 
     // Convert `str` as an integer then divide the result by `base` raised to a power such that the
     // fraction part will be restored.
     i = str.indexOf('.');
     isFloat = i >= 0;
     Ctor = x.constructor;
 
     if (isFloat) {
       str = str.replace('.', '');
       len = str.length;
       i = len - i;
 
       // log[10](16) = 1.2041... , log[10](88) = 1.9444....
       divisor = intPow(Ctor, new Ctor(base), i, i * 2);
     }
 
     xd = convertBase(str, base, BASE);
     xe = xd.length - 1;
 
     // Remove trailing zeros.
     for (i = xe; xd[i] === 0; --i) xd.pop();
     if (i < 0) return new Ctor(x.s * 0);
     x.e = getBase10Exponent(xd, xe);
     x.d = xd;
     external = false;
 
     // At what precision to perform the division to ensure exact conversion?
     // maxDecimalIntegerPartDigitCount = ceil(log[10](b) * otherBaseIntegerPartDigitCount)
     // log[10](2) = 0.30103, log[10](8) = 0.90309, log[10](16) = 1.20412
     // E.g. ceil(1.2 * 3) = 4, so up to 4 decimal digits are needed to represent 3 hex int digits.
     // maxDecimalFractionPartDigitCount = {Hex:4|Oct:3|Bin:1} * otherBaseFractionPartDigitCount
     // Therefore using 4 * the number of digits of str will always be enough.
     if (isFloat) x = divide(x, divisor, len * 4);
 
     // Multiply by the binary exponent part if present.
     if (p) x = x.times(Math.abs(p) < 54 ? mathpow(2, p) : Decimal.pow(2, p));
     external = true;
 
     return x;
   }
 
 
   /*
    * sin(x) = x - x^3/3! + x^5/5! - ...
    * |x| < pi/2
    *
    */
   function sine(Ctor, x) {
     var k,
       len = x.d.length;
 
     if (len < 3) {
       return x.isZero() ? x : taylorSeries(Ctor, 2, x, x);
     }
 
     // Argument reduction: sin(5x) = 16*sin^5(x) - 20*sin^3(x) + 5*sin(x)
     // i.e. sin(x) = 16*sin^5(x/5) - 20*sin^3(x/5) + 5*sin(x/5)
     // and  sin(x) = sin(x/5)(5 + sin^2(x/5)(16sin^2(x/5) - 20))
 
     // Estimate the optimum number of times to use the argument reduction.
     k = 1.4 * Math.sqrt(len);
     k = k > 16 ? 16 : k | 0;
 
     x = x.times(1 / tinyPow(5, k));
     x = taylorSeries(Ctor, 2, x, x);
 
     // Reverse argument reduction
     var sin2_x,
       d5 = new Ctor(5),
       d16 = new Ctor(16),
       d20 = new Ctor(20);
     for (; k--;) {
       sin2_x = x.times(x);
       x = x.times(d5.plus(sin2_x.times(d16.times(sin2_x).minus(d20))));
     }
 
     return x;
   }
 
 
   // Calculate Taylor series for `cos`, `cosh`, `sin` and `sinh`.
   function taylorSeries(Ctor, n, x, y, isHyperbolic) {
     var j, t, u, x2,
       i = 1,
       pr = Ctor.precision,
       k = Math.ceil(pr / LOG_BASE);
 
     external = false;
     x2 = x.times(x);
     u = new Ctor(y);
 
     for (;;) {
       t = divide(u.times(x2), new Ctor(n++ * n++), pr, 1);
       u = isHyperbolic ? y.plus(t) : y.minus(t);
       y = divide(t.times(x2), new Ctor(n++ * n++), pr, 1);
       t = u.plus(y);
 
       if (t.d[k] !== void 0) {
         for (j = k; t.d[j] === u.d[j] && j--;);
         if (j == -1) break;
       }
 
       j = u;
       u = y;
       y = t;
       t = j;
       i++;
     }
 
     external = true;
     t.d.length = k + 1;
 
     return t;
   }
 
 
   // Exponent e must be positive and non-zero.
   function tinyPow(b, e) {
     var n = b;
     while (--e) n *= b;
     return n;
   }
 
 
   // Return the absolute value of `x` reduced to less than or equal to half pi.
   function toLessThanHalfPi(Ctor, x) {
     var t,
       isNeg = x.s < 0,
       pi = getPi(Ctor, Ctor.precision, 1),
       halfPi = pi.times(0.5);
 
     x = x.abs();
 
     if (x.lte(halfPi)) {
       quadrant = isNeg ? 4 : 1;
       return x;
     }
 
     t = x.divToInt(pi);
 
     if (t.isZero()) {
       quadrant = isNeg ? 3 : 2;
     } else {
       x = x.minus(t.times(pi));
 
       // 0 <= x < pi
       if (x.lte(halfPi)) {
         quadrant = isOdd(t) ? (isNeg ? 2 : 3) : (isNeg ? 4 : 1);
         return x;
       }
 
       quadrant = isOdd(t) ? (isNeg ? 1 : 4) : (isNeg ? 3 : 2);
     }
 
     return x.minus(pi).abs();
   }
 
 
   /*
    * Return the value of Decimal `x` as a string in base `baseOut`.
    *
    * If the optional `sd` argument is present include a binary exponent suffix.
    */
   function toStringBinary(x, baseOut, sd, rm) {
     var base, e, i, k, len, roundUp, str, xd, y,
       Ctor = x.constructor,
       isExp = sd !== void 0;
 
     if (isExp) {
       checkInt32(sd, 1, MAX_DIGITS);
       if (rm === void 0) rm = Ctor.rounding;
       else checkInt32(rm, 0, 8);
     } else {
       sd = Ctor.precision;
       rm = Ctor.rounding;
     }
 
     if (!x.isFinite()) {
       str = nonFiniteToString(x);
     } else {
       str = finiteToString(x);
       i = str.indexOf('.');
 
       // Use exponential notation according to `toExpPos` and `toExpNeg`? No, but if required:
       // maxBinaryExponent = floor((decimalExponent + 1) * log[2](10))
       // minBinaryExponent = floor(decimalExponent * log[2](10))
       // log[2](10) = 3.321928094887362347870319429489390175864
 
       if (isExp) {
         base = 2;
         if (baseOut == 16) {
           sd = sd * 4 - 3;
         } else if (baseOut == 8) {
           sd = sd * 3 - 2;
         }
       } else {
         base = baseOut;
       }
 
       // Convert the number as an integer then divide the result by its base raised to a power such
       // that the fraction part will be restored.
 
       // Non-integer.
       if (i >= 0) {
         str = str.replace('.', '');
         y = new Ctor(1);
         y.e = str.length - i;
         y.d = convertBase(finiteToString(y), 10, base);
         y.e = y.d.length;
       }
 
       xd = convertBase(str, 10, base);
       e = len = xd.length;
 
       // Remove trailing zeros.
       for (; xd[--len] == 0;) xd.pop();
 
       if (!xd[0]) {
         str = isExp ? '0p+0' : '0';
       } else {
         if (i < 0) {
           e--;
         } else {
           x = new Ctor(x);
           x.d = xd;
           x.e = e;
           x = divide(x, y, sd, rm, 0, base);
           xd = x.d;
           e = x.e;
           roundUp = inexact;
         }
 
         // The rounding digit, i.e. the digit after the digit that may be rounded up.
         i = xd[sd];
         k = base / 2;
         roundUp = roundUp || xd[sd + 1] !== void 0;
 
         roundUp = rm < 4
           ? (i !== void 0 || roundUp) && (rm === 0 || rm === (x.s < 0 ? 3 : 2))
           : i > k || i === k && (rm === 4 || roundUp || rm === 6 && xd[sd - 1] & 1 ||
             rm === (x.s < 0 ? 8 : 7));
 
         xd.length = sd;
 
         if (roundUp) {
 
           // Rounding up may mean the previous digit has to be rounded up and so on.
           for (; ++xd[--sd] > base - 1;) {
             xd[sd] = 0;
             if (!sd) {
               ++e;
               xd.unshift(1);
             }
           }
         }
 
         // Determine trailing zeros.
         for (len = xd.length; !xd[len - 1]; --len);
 
         // E.g. [4, 11, 15] becomes 4bf.
         for (i = 0, str = ''; i < len; i++) str += NUMERALS.charAt(xd[i]);
 
         // Add binary exponent suffix?
         if (isExp) {
           if (len > 1) {
             if (baseOut == 16 || baseOut == 8) {
               i = baseOut == 16 ? 4 : 3;
               for (--len; len % i; len++) str += '0';
               xd = convertBase(str, base, baseOut);
               for (len = xd.length; !xd[len - 1]; --len);
 
               // xd[0] will always be be 1
               for (i = 1, str = '1.'; i < len; i++) str += NUMERALS.charAt(xd[i]);
             } else {
               str = str.charAt(0) + '.' + str.slice(1);
             }
           }
 
           str =  str + (e < 0 ? 'p' : 'p+') + e;
         } else if (e < 0) {
           for (; ++e;) str = '0' + str;
           str = '0.' + str;
         } else {
           if (++e > len) for (e -= len; e-- ;) str += '0';
           else if (e < len) str = str.slice(0, e) + '.' + str.slice(e);
         }
       }
 
       str = (baseOut == 16 ? '0x' : baseOut == 2 ? '0b' : baseOut == 8 ? '0o' : '') + str;
     }
 
     return x.s < 0 ? '-' + str : str;
   }
 
 
   // Does not strip trailing zeros.
   function truncate(arr, len) {
     if (arr.length > len) {
       arr.length = len;
       return true;
     }
   }
 
 
   // Decimal methods
 
 
   /*
    *  abs
    *  acos
    *  acosh
    *  add
    *  asin
    *  asinh
    *  atan
    *  atanh
    *  atan2
    *  cbrt
    *  ceil
    *  clamp
    *  clone
    *  config
    *  cos
    *  cosh
    *  div
    *  exp
    *  floor
    *  hypot
    *  ln
    *  log
    *  log2
    *  log10
    *  max
    *  min
    *  mod
    *  mul
    *  pow
    *  random
    *  round
    *  set
    *  sign
    *  sin
    *  sinh
    *  sqrt
    *  sub
    *  sum
    *  tan
    *  tanh
    *  trunc
    */
 
 
   /*
    * Return a new Decimal whose value is the absolute value of `x`.
    *
    * x {number|string|Decimal}
    *
    */
   function abs(x) {
     return new this(x).abs();
   }
 
 
   /*
    * Return a new Decimal whose value is the arccosine in radians of `x`.
    *
    * x {number|string|Decimal}
    *
    */
   function acos(x) {
     return new this(x).acos();
   }
 
 
   /*
    * Return a new Decimal whose value is the inverse of the hyperbolic cosine of `x`, rounded to
    * `precision` significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function acosh(x) {
     return new this(x).acosh();
   }
 
 
   /*
    * Return a new Decimal whose value is the sum of `x` and `y`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    * y {number|string|Decimal}
    *
    */
   function add(x, y) {
     return new this(x).plus(y);
   }
 
 
   /*
    * Return a new Decimal whose value is the arcsine in radians of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function asin(x) {
     return new this(x).asin();
   }
 
 
   /*
    * Return a new Decimal whose value is the inverse of the hyperbolic sine of `x`, rounded to
    * `precision` significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function asinh(x) {
     return new this(x).asinh();
   }
 
 
   /*
    * Return a new Decimal whose value is the arctangent in radians of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function atan(x) {
     return new this(x).atan();
   }
 
 
   /*
    * Return a new Decimal whose value is the inverse of the hyperbolic tangent of `x`, rounded to
    * `precision` significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function atanh(x) {
     return new this(x).atanh();
   }
 
 
   /*
    * Return a new Decimal whose value is the arctangent in radians of `y/x` in the range -pi to pi
    * (inclusive), rounded to `precision` significant digits using rounding mode `rounding`.
    *
    * Domain: [-Infinity, Infinity]
    * Range: [-pi, pi]
    *
    * y {number|string|Decimal} The y-coordinate.
    * x {number|string|Decimal} The x-coordinate.
    *
    * atan2(±0, -0)               = ±pi
    * atan2(±0, +0)               = ±0
    * atan2(±0, -x)               = ±pi for x > 0
    * atan2(±0, x)                = ±0 for x > 0
    * atan2(-y, ±0)               = -pi/2 for y > 0
    * atan2(y, ±0)                = pi/2 for y > 0
    * atan2(±y, -Infinity)        = ±pi for finite y > 0
    * atan2(±y, +Infinity)        = ±0 for finite y > 0
    * atan2(±Infinity, x)         = ±pi/2 for finite x
    * atan2(±Infinity, -Infinity) = ±3*pi/4
    * atan2(±Infinity, +Infinity) = ±pi/4
    * atan2(NaN, x) = NaN
    * atan2(y, NaN) = NaN
    *
    */
   function atan2(y, x) {
     y = new this(y);
     x = new this(x);
     var r,
       pr = this.precision,
       rm = this.rounding,
       wpr = pr + 4;
 
     // Either NaN
     if (!y.s || !x.s) {
       r = new this(NaN);
 
     // Both ±Infinity
     } else if (!y.d && !x.d) {
       r = getPi(this, wpr, 1).times(x.s > 0 ? 0.25 : 0.75);
       r.s = y.s;
 
     // x is ±Infinity or y is ±0
     } else if (!x.d || y.isZero()) {
       r = x.s < 0 ? getPi(this, pr, rm) : new this(0);
       r.s = y.s;
 
     // y is ±Infinity or x is ±0
     } else if (!y.d || x.isZero()) {
       r = getPi(this, wpr, 1).times(0.5);
       r.s = y.s;
 
     // Both non-zero and finite
     } else if (x.s < 0) {
       this.precision = wpr;
       this.rounding = 1;
       r = this.atan(divide(y, x, wpr, 1));
       x = getPi(this, wpr, 1);
       this.precision = pr;
       this.rounding = rm;
       r = y.s < 0 ? r.minus(x) : r.plus(x);
     } else {
       r = this.atan(divide(y, x, wpr, 1));
     }
 
     return r;
   }
 
 
   /*
    * Return a new Decimal whose value is the cube root of `x`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function cbrt(x) {
     return new this(x).cbrt();
   }
 
 
   /*
    * Return a new Decimal whose value is `x` rounded to an integer using `ROUND_CEIL`.
    *
    * x {number|string|Decimal}
    *
    */
   function ceil(x) {
     return finalise(x = new this(x), x.e + 1, 2);
   }
 
 
   /*
    * Return a new Decimal whose value is `x` clamped to the range delineated by `min` and `max`.
    *
    * x {number|string|Decimal}
    * min {number|string|Decimal}
    * max {number|string|Decimal}
    *
    */
   function clamp(x, min, max) {
     return new this(x).clamp(min, max);
   }
 
 
   /*
    * Configure global settings for a Decimal constructor.
    *
    * `obj` is an object with one or more of the following properties,
    *
    *   precision  {number}
    *   rounding   {number}
    *   toExpNeg   {number}
    *   toExpPos   {number}
    *   maxE       {number}
    *   minE       {number}
    *   modulo     {number}
    *   crypto     {boolean|number}
    *   defaults   {true}
    *
    * E.g. Decimal.config({ precision: 20, rounding: 4 })
    *
    */
   function config(obj) {
     if (!obj || typeof obj !== 'object') throw Error(decimalError + 'Object expected');
     var i, p, v,
       useDefaults = obj.defaults === true,
       ps = [
         'precision', 1, MAX_DIGITS,
         'rounding', 0, 8,
         'toExpNeg', -EXP_LIMIT, 0,
         'toExpPos', 0, EXP_LIMIT,
         'maxE', 0, EXP_LIMIT,
         'minE', -EXP_LIMIT, 0,
         'modulo', 0, 9
       ];
 
     for (i = 0; i < ps.length; i += 3) {
       if (p = ps[i], useDefaults) this[p] = DEFAULTS[p];
       if ((v = obj[p]) !== void 0) {
         if (mathfloor(v) === v && v >= ps[i + 1] && v <= ps[i + 2]) this[p] = v;
         else throw Error(invalidArgument + p + ': ' + v);
       }
     }
 
     if (p = 'crypto', useDefaults) this[p] = DEFAULTS[p];
     if ((v = obj[p]) !== void 0) {
       if (v === true || v === false || v === 0 || v === 1) {
         if (v) {
           if (typeof crypto != 'undefined' && crypto &&
             (crypto.getRandomValues || crypto.randomBytes)) {
             this[p] = true;
           } else {
             throw Error(cryptoUnavailable);
           }
         } else {
           this[p] = false;
         }
       } else {
         throw Error(invalidArgument + p + ': ' + v);
       }
     }
 
     return this;
   }
 
 
   /*
    * Return a new Decimal whose value is the cosine of `x`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function cos(x) {
     return new this(x).cos();
   }
 
 
   /*
    * Return a new Decimal whose value is the hyperbolic cosine of `x`, rounded to precision
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function cosh(x) {
     return new this(x).cosh();
   }
 
 
   /*
    * Create and return a Decimal constructor with the same configuration properties as this Decimal
    * constructor.
    *
    */
   function clone(obj) {
     var i, p, ps;
 
     /*
      * The Decimal constructor and exported function.
      * Return a new Decimal instance.
      *
      * v {number|string|Decimal} A numeric value.
      *
      */
     function Decimal(v) {
       var e, i, t,
         x = this;
 
       // Decimal called without new.
       if (!(x instanceof Decimal)) return new Decimal(v);
 
       // Retain a reference to this Decimal constructor, and shadow Decimal.prototype.constructor
       // which points to Object.
       x.constructor = Decimal;
 
       // Duplicate.
       if (isDecimalInstance(v)) {
         x.s = v.s;
 
         if (external) {
           if (!v.d || v.e > Decimal.maxE) {
 
             // Infinity.
             x.e = NaN;
             x.d = null;
           } else if (v.e < Decimal.minE) {
 
             // Zero.
             x.e = 0;
             x.d = [0];
           } else {
             x.e = v.e;
             x.d = v.d.slice();
           }
         } else {
           x.e = v.e;
           x.d = v.d ? v.d.slice() : v.d;
         }
 
         return;
       }
 
       t = typeof v;
 
       if (t === 'number') {
         if (v === 0) {
           x.s = 1 / v < 0 ? -1 : 1;
           x.e = 0;
           x.d = [0];
           return;
         }
 
         if (v < 0) {
           v = -v;
           x.s = -1;
         } else {
           x.s = 1;
         }
 
         // Fast path for small integers.
         if (v === ~~v && v < 1e7) {
           for (e = 0, i = v; i >= 10; i /= 10) e++;
 
           if (external) {
             if (e > Decimal.maxE) {
               x.e = NaN;
               x.d = null;
             } else if (e < Decimal.minE) {
               x.e = 0;
               x.d = [0];
             } else {
               x.e = e;
               x.d = [v];
             }
           } else {
             x.e = e;
             x.d = [v];
           }
 
           return;
 
         // Infinity, NaN.
         } else if (v * 0 !== 0) {
           if (!v) x.s = NaN;
           x.e = NaN;
           x.d = null;
           return;
         }
 
         return parseDecimal(x, v.toString());
 
       } else if (t !== 'string') {
         throw Error(invalidArgument + v);
       }
 
       // Minus sign?
       if ((i = v.charCodeAt(0)) === 45) {
         v = v.slice(1);
         x.s = -1;
       } else {
         // Plus sign?
         if (i === 43) v = v.slice(1);
         x.s = 1;
       }
 
       return isDecimal.test(v) ? parseDecimal(x, v) : parseOther(x, v);
     }
 
     Decimal.prototype = P;
 
     Decimal.ROUND_UP = 0;
     Decimal.ROUND_DOWN = 1;
     Decimal.ROUND_CEIL = 2;
     Decimal.ROUND_FLOOR = 3;
     Decimal.ROUND_HALF_UP = 4;
     Decimal.ROUND_HALF_DOWN = 5;
     Decimal.ROUND_HALF_EVEN = 6;
     Decimal.ROUND_HALF_CEIL = 7;
     Decimal.ROUND_HALF_FLOOR = 8;
     Decimal.EUCLID = 9;
 
     Decimal.config = Decimal.set = config;
     Decimal.clone = clone;
     Decimal.isDecimal = isDecimalInstance;
 
     Decimal.abs = abs;
     Decimal.acos = acos;
     Decimal.acosh = acosh;        // ES6
     Decimal.add = add;
     Decimal.asin = asin;
     Decimal.asinh = asinh;        // ES6
     Decimal.atan = atan;
     Decimal.atanh = atanh;        // ES6
     Decimal.atan2 = atan2;
     Decimal.cbrt = cbrt;          // ES6
     Decimal.ceil = ceil;
     Decimal.clamp = clamp;
     Decimal.cos = cos;
     Decimal.cosh = cosh;          // ES6
     Decimal.div = div;
     Decimal.exp = exp;
     Decimal.floor = floor;
     Decimal.hypot = hypot;        // ES6
     Decimal.ln = ln;
     Decimal.log = log;
     Decimal.log10 = log10;        // ES6
     Decimal.log2 = log2;          // ES6
     Decimal.max = max;
     Decimal.min = min;
     Decimal.mod = mod;
     Decimal.mul = mul;
     Decimal.pow = pow;
     Decimal.random = random;
     Decimal.round = round;
     Decimal.sign = sign;          // ES6
     Decimal.sin = sin;
     Decimal.sinh = sinh;          // ES6
     Decimal.sqrt = sqrt;
     Decimal.sub = sub;
     Decimal.sum = sum;
     Decimal.tan = tan;
     Decimal.tanh = tanh;          // ES6
     Decimal.trunc = trunc;        // ES6
 
     if (obj === void 0) obj = {};
     if (obj) {
       if (obj.defaults !== true) {
         ps = ['precision', 'rounding', 'toExpNeg', 'toExpPos', 'maxE', 'minE', 'modulo', 'crypto'];
         for (i = 0; i < ps.length;) if (!obj.hasOwnProperty(p = ps[i++])) obj[p] = this[p];
       }
     }
 
     Decimal.config(obj);
 
     return Decimal;
   }
 
 
   /*
    * Return a new Decimal whose value is `x` divided by `y`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    * y {number|string|Decimal}
    *
    */
   function div(x, y) {
     return new this(x).div(y);
   }
 
 
   /*
    * Return a new Decimal whose value is the natural exponential of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} The power to which to raise the base of the natural log.
    *
    */
   function exp(x) {
     return new this(x).exp();
   }
 
 
   /*
    * Return a new Decimal whose value is `x` round to an integer using `ROUND_FLOOR`.
    *
    * x {number|string|Decimal}
    *
    */
   function floor(x) {
     return finalise(x = new this(x), x.e + 1, 3);
   }
 
 
   /*
    * Return a new Decimal whose value is the square root of the sum of the squares of the arguments,
    * rounded to `precision` significant digits using rounding mode `rounding`.
    *
    * hypot(a, b, ...) = sqrt(a^2 + b^2 + ...)
    *
    * arguments {number|string|Decimal}
    *
    */
   function hypot() {
     var i, n,
       t = new this(0);
 
     external = false;
 
     for (i = 0; i < arguments.length;) {
       n = new this(arguments[i++]);
       if (!n.d) {
         if (n.s) {
           external = true;
           return new this(1 / 0);
         }
         t = n;
       } else if (t.d) {
         t = t.plus(n.times(n));
       }
     }
 
     external = true;
 
     return t.sqrt();
   }
 
 
   /*
    * Return true if object is a Decimal instance (where Decimal is any Decimal constructor),
    * otherwise return false.
    *
    */
   function isDecimalInstance(obj) {
     return obj instanceof Decimal || obj && obj.toStringTag === tag || false;
   }
 
 
   /*
    * Return a new Decimal whose value is the natural logarithm of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function ln(x) {
     return new this(x).ln();
   }
 
 
   /*
    * Return a new Decimal whose value is the log of `x` to the base `y`, or to base 10 if no base
    * is specified, rounded to `precision` significant digits using rounding mode `rounding`.
    *
    * log[y](x)
    *
    * x {number|string|Decimal} The argument of the logarithm.
    * y {number|string|Decimal} The base of the logarithm.
    *
    */
   function log(x, y) {
     return new this(x).log(y);
   }
 
 
   /*
    * Return a new Decimal whose value is the base 2 logarithm of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function log2(x) {
     return new this(x).log(2);
   }
 
 
   /*
    * Return a new Decimal whose value is the base 10 logarithm of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function log10(x) {
     return new this(x).log(10);
   }
 
 
   /*
    * Return a new Decimal whose value is the maximum of the arguments.
    *
    * arguments {number|string|Decimal}
    *
    */
   function max() {
     return maxOrMin(this, arguments, 'lt');
   }
 
 
   /*
    * Return a new Decimal whose value is the minimum of the arguments.
    *
    * arguments {number|string|Decimal}
    *
    */
   function min() {
     return maxOrMin(this, arguments, 'gt');
   }
 
 
   /*
    * Return a new Decimal whose value is `x` modulo `y`, rounded to `precision` significant digits
    * using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    * y {number|string|Decimal}
    *
    */
   function mod(x, y) {
     return new this(x).mod(y);
   }
 
 
   /*
    * Return a new Decimal whose value is `x` multiplied by `y`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    * y {number|string|Decimal}
    *
    */
   function mul(x, y) {
     return new this(x).mul(y);
   }
 
 
   /*
    * Return a new Decimal whose value is `x` raised to the power `y`, rounded to precision
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} The base.
    * y {number|string|Decimal} The exponent.
    *
    */
   function pow(x, y) {
     return new this(x).pow(y);
   }
 
 
   /*
    * Returns a new Decimal with a random value equal to or greater than 0 and less than 1, and with
    * `sd`, or `Decimal.precision` if `sd` is omitted, significant digits (or less if trailing zeros
    * are produced).
    *
    * [sd] {number} Significant digits. Integer, 0 to MAX_DIGITS inclusive.
    *
    */
   function random(sd) {
     var d, e, k, n,
       i = 0,
       r = new this(1),
       rd = [];
 
     if (sd === void 0) sd = this.precision;
     else checkInt32(sd, 1, MAX_DIGITS);
 
     k = Math.ceil(sd / LOG_BASE);
 
     if (!this.crypto) {
       for (; i < k;) rd[i++] = Math.random() * 1e7 | 0;
 
     // Browsers supporting crypto.getRandomValues.
     } else if (crypto.getRandomValues) {
       d = crypto.getRandomValues(new Uint32Array(k));
 
       for (; i < k;) {
         n = d[i];
 
         // 0 <= n < 4294967296
         // Probability n >= 4.29e9, is 4967296 / 4294967296 = 0.00116 (1 in 865).
         if (n >= 4.29e9) {
           d[i] = crypto.getRandomValues(new Uint32Array(1))[0];
         } else {
 
           // 0 <= n <= 4289999999
           // 0 <= (n % 1e7) <= 9999999
           rd[i++] = n % 1e7;
         }
       }
 
     // Node.js supporting crypto.randomBytes.
     } else if (crypto.randomBytes) {
 
       // buffer
       d = crypto.randomBytes(k *= 4);
 
       for (; i < k;) {
 
         // 0 <= n < 2147483648
         n = d[i] + (d[i + 1] << 8) + (d[i + 2] << 16) + ((d[i + 3] & 0x7f) << 24);
 
         // Probability n >= 2.14e9, is 7483648 / 2147483648 = 0.0035 (1 in 286).
         if (n >= 2.14e9) {
           crypto.randomBytes(4).copy(d, i);
         } else {
 
           // 0 <= n <= 2139999999
           // 0 <= (n % 1e7) <= 9999999
           rd.push(n % 1e7);
           i += 4;
         }
       }
 
       i = k / 4;
     } else {
       throw Error(cryptoUnavailable);
     }
 
     k = rd[--i];
     sd %= LOG_BASE;
 
     // Convert trailing digits to zeros according to sd.
     if (k && sd) {
       n = mathpow(10, LOG_BASE - sd);
       rd[i] = (k / n | 0) * n;
     }
 
     // Remove trailing words which are zero.
     for (; rd[i] === 0; i--) rd.pop();
 
     // Zero?
     if (i < 0) {
       e = 0;
       rd = [0];
     } else {
       e = -1;
 
       // Remove leading words which are zero and adjust exponent accordingly.
       for (; rd[0] === 0; e -= LOG_BASE) rd.shift();
 
       // Count the digits of the first word of rd to determine leading zeros.
       for (k = 1, n = rd[0]; n >= 10; n /= 10) k++;
 
       // Adjust the exponent for leading zeros of the first word of rd.
       if (k < LOG_BASE) e -= LOG_BASE - k;
     }
 
     r.e = e;
     r.d = rd;
 
     return r;
   }
 
 
   /*
    * Return a new Decimal whose value is `x` rounded to an integer using rounding mode `rounding`.
    *
    * To emulate `Math.round`, set rounding to 7 (ROUND_HALF_CEIL).
    *
    * x {number|string|Decimal}
    *
    */
   function round(x) {
     return finalise(x = new this(x), x.e + 1, this.rounding);
   }
 
 
   /*
    * Return
    *   1    if x > 0,
    *  -1    if x < 0,
    *   0    if x is 0,
    *  -0    if x is -0,
    *   NaN  otherwise
    *
    * x {number|string|Decimal}
    *
    */
   function sign(x) {
     x = new this(x);
     return x.d ? (x.d[0] ? x.s : 0 * x.s) : x.s || NaN;
   }
 
 
   /*
    * Return a new Decimal whose value is the sine of `x`, rounded to `precision` significant digits
    * using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function sin(x) {
     return new this(x).sin();
   }
 
 
   /*
    * Return a new Decimal whose value is the hyperbolic sine of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function sinh(x) {
     return new this(x).sinh();
   }
 
 
   /*
    * Return a new Decimal whose value is the square root of `x`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    *
    */
   function sqrt(x) {
     return new this(x).sqrt();
   }
 
 
   /*
    * Return a new Decimal whose value is `x` minus `y`, rounded to `precision` significant digits
    * using rounding mode `rounding`.
    *
    * x {number|string|Decimal}
    * y {number|string|Decimal}
    *
    */
   function sub(x, y) {
     return new this(x).sub(y);
   }
 
 
   /*
    * Return a new Decimal whose value is the sum of the arguments, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * Only the result is rounded, not the intermediate calculations.
    *
    * arguments {number|string|Decimal}
    *
    */
   function sum() {
     var i = 0,
       args = arguments,
       x = new this(args[i]);
 
     external = false;
     for (; x.s && ++i < args.length;) x = x.plus(args[i]);
     external = true;
 
     return finalise(x, this.precision, this.rounding);
   }
 
 
   /*
    * Return a new Decimal whose value is the tangent of `x`, rounded to `precision` significant
    * digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function tan(x) {
     return new this(x).tan();
   }
 
 
   /*
    * Return a new Decimal whose value is the hyperbolic tangent of `x`, rounded to `precision`
    * significant digits using rounding mode `rounding`.
    *
    * x {number|string|Decimal} A value in radians.
    *
    */
   function tanh(x) {
     return new this(x).tanh();
   }
 
 
   /*
    * Return a new Decimal whose value is `x` truncated to an integer.
    *
    * x {number|string|Decimal}
    *
    */
   function trunc(x) {
     return finalise(x = new this(x), x.e + 1, 1);
   }
 
 
   // Create and configure initial Decimal constructor.
   Decimal = clone(DEFAULTS);
   Decimal.prototype.constructor = Decimal;
   Decimal['default'] = Decimal.Decimal = Decimal;
 
   // Create the internal constants from their string values.
   LN10 = new Decimal(LN10);
   PI = new Decimal(PI);
 
 
   // Export.
 
 
   // AMD.
   if (typeof define == 'function' && define.amd) {
     define(function () {
       return Decimal;
     });
 
   // Node and other environments that support module.exports.
   } else if (typeof module != 'undefined' && module.exports) {
     if (typeof Symbol == 'function' && typeof Symbol.iterator == 'symbol') {
       P[Symbol['for']('nodejs.util.inspect.custom')] = P.toString;
       P[Symbol.toStringTag] = 'Decimal';
     }
 
     module.exports = Decimal;
 
   // Browser.
   } else {
     if (!globalScope) {
       globalScope = typeof self != 'undefined' && self && self.self == self ? self : window;
     }
 
     noConflict = globalScope.Decimal;
     Decimal.noConflict = function () {
       globalScope.Decimal = noConflict;
       return Decimal;
     };
 
     globalScope.Decimal = Decimal;
   }
 })(this);