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+![decimal.js](https://raw.githubusercontent.com/MikeMcl/decimal.js/gh-pages/decimaljs.png)
+
+An arbitrary-precision Decimal type for JavaScript.
+
+[![npm version](https://img.shields.io/npm/v/decimal.js.svg)](https://www.npmjs.com/package/decimal.js)
+[![npm downloads](https://img.shields.io/npm/dw/decimal.js)](https://www.npmjs.com/package/decimal.js)
+[![Build Status](https://travis-ci.org/MikeMcl/decimal.js.svg)](https://travis-ci.org/MikeMcl/decimal.js)
+[![CDNJS](https://img.shields.io/cdnjs/v/decimal.js.svg)](https://cdnjs.com/libraries/decimal.js)
+
+<br>
+
+## Features
+
+ - Integers and floats
+ - Simple but full-featured API
+ - Replicates many of the methods of JavaScript's `Number.prototype` and `Math` objects
+ - Also handles hexadecimal, binary and octal values
+ - Faster, smaller, and perhaps easier to use than JavaScript versions of Java's BigDecimal
+ - No dependencies
+ - Wide platform compatibility: uses JavaScript 1.5 (ECMAScript 3) features only
+ - Comprehensive [documentation](https://mikemcl.github.io/decimal.js/) and test set
+ - Used under the hood by [math.js](https://github.com/josdejong/mathjs)
+ - Includes a TypeScript declaration file: *decimal.d.ts*
+
+![API](https://raw.githubusercontent.com/MikeMcl/decimal.js/gh-pages/API.png)
+
+The library is similar to [bignumber.js](https://github.com/MikeMcl/bignumber.js/), but here
+precision is specified in terms of significant digits rather than decimal places, and all
+calculations are rounded to the precision (similar to Python's decimal module) rather than just
+those involving division.
+
+This library also adds the trigonometric functions, among others, and supports non-integer powers,
+which makes it a significantly larger library than *bignumber.js* and the even smaller
+[big.js](https://github.com/MikeMcl/big.js/).
+
+For a lighter version of this library without the trigonometric functions see
+[decimal.js-light](https://github.com/MikeMcl/decimal.js-light/).
+
+## Load
+
+The library is the single JavaScript file *decimal.js* or ES module *decimal.mjs*.
+
+Browser:
+
+```html
+<script src='path/to/decimal.js'></script>
+
+<script type="module">
+ import Decimal from './path/to/decimal.mjs';
+ ...
+</script>
+```
+
+[Node.js](https://nodejs.org):
+
+```bash
+npm install decimal.js
+```
+```js
+const Decimal = require('decimal.js');
+
+import Decimal from 'decimal.js';
+
+import {Decimal} from 'decimal.js';
+```
+
+## Use
+
+*In all examples below, semicolons and `toString` calls are not shown.
+If a commented-out value is in quotes it means `toString` has been called on the preceding expression.*
+
+The library exports a single constructor function, `Decimal`, which expects a single argument that is a number, string or Decimal instance.
+
+```js
+x = new Decimal(123.4567)
+y = new Decimal('123456.7e-3')
+z = new Decimal(x)
+x.equals(y) && y.equals(z) && x.equals(z) // true
+```
+
+If using values with more than a few digits, it is recommended to pass strings rather than numbers to avoid a potential loss of precision.
+
+```js
+// Precision loss from using numeric literals with more than 15 significant digits.
+new Decimal(1.0000000000000001) // '1'
+new Decimal(88259496234518.57) // '88259496234518.56'
+new Decimal(99999999999999999999) // '100000000000000000000'
+
+// Precision loss from using numeric literals outside the range of Number values.
+new Decimal(2e+308) // 'Infinity'
+new Decimal(1e-324) // '0'
+
+// Precision loss from the unexpected result of arithmetic with Number values.
+new Decimal(0.7 + 0.1) // '0.7999999999999999'
+```
+
+As with JavaScript numbers, strings can contain underscores as separators to improve readability.
+
+```js
+x = new Decimal('2_147_483_647')
+```
+
+String values in binary, hexadecimal or octal notation are also accepted if the appropriate prefix is included.
+
+```js
+x = new Decimal('0xff.f') // '255.9375'
+y = new Decimal('0b10101100') // '172'
+z = x.plus(y) // '427.9375'
+
+z.toBinary() // '0b110101011.1111'
+z.toBinary(13) // '0b1.101010111111p+8'
+
+// Using binary exponential notation to create a Decimal with the value of `Number.MAX_VALUE`.
+x = new Decimal('0b1.1111111111111111111111111111111111111111111111111111p+1023')
+// '1.7976931348623157081e+308'
+```
+
+Decimal instances are immutable in the sense that they are not changed by their methods.
+
+```js
+0.3 - 0.1 // 0.19999999999999998
+x = new Decimal(0.3)
+x.minus(0.1) // '0.2'
+x // '0.3'
+```
+
+The methods that return a Decimal can be chained.
+
+```js
+x.dividedBy(y).plus(z).times(9).floor()
+x.times('1.23456780123456789e+9').plus(9876.5432321).dividedBy('4444562598.111772').ceil()
+```
+
+Many method names have a shorter alias.
+
+```js
+x.squareRoot().dividedBy(y).toPower(3).equals(x.sqrt().div(y).pow(3)) // true
+x.comparedTo(y.modulo(z).negated() === x.cmp(y.mod(z).neg()) // true
+```
+
+Most of the methods of JavaScript's `Number.prototype` and `Math` objects are replicated.
+
+```js
+x = new Decimal(255.5)
+x.toExponential(5) // '2.55500e+2'
+x.toFixed(5) // '255.50000'
+x.toPrecision(5) // '255.50'
+
+Decimal.sqrt('6.98372465832e+9823') // '8.3568682281821340204e+4911'
+Decimal.pow(2, 0.0979843) // '1.0702770511687781839'
+
+// Using `toFixed()` to avoid exponential notation:
+x = new Decimal('0.0000001')
+x.toString() // '1e-7'
+x.toFixed() // '0.0000001'
+```
+
+And there are `isNaN` and `isFinite` methods, as `NaN` and `Infinity` are valid `Decimal` values.
+
+```js
+x = new Decimal(NaN) // 'NaN'
+y = new Decimal(Infinity) // 'Infinity'
+x.isNaN() && !y.isNaN() && !x.isFinite() && !y.isFinite() // true
+```
+
+There is also a `toFraction` method with an optional *maximum denominator* argument.
+
+```js
+z = new Decimal(355)
+pi = z.dividedBy(113) // '3.1415929204'
+pi.toFraction() // [ '7853982301', '2500000000' ]
+pi.toFraction(1000) // [ '355', '113' ]
+```
+
+All calculations are rounded according to the number of significant digits and rounding mode specified
+by the `precision` and `rounding` properties of the Decimal constructor.
+
+For advanced usage, multiple Decimal constructors can be created, each with their own independent
+configuration which applies to all Decimal numbers created from it.
+
+```js
+// Set the precision and rounding of the default Decimal constructor
+Decimal.set({ precision: 5, rounding: 4 })
+
+// Create another Decimal constructor, optionally passing in a configuration object
+Dec = Decimal.clone({ precision: 9, rounding: 1 })
+
+x = new Decimal(5)
+y = new Dec(5)
+
+x.div(3) // '1.6667'
+y.div(3) // '1.66666666'
+```
+
+The value of a Decimal is stored in a floating point format in terms of its digits, exponent and sign, but these properties should be considered read-only.
+
+```js
+x = new Decimal(-12345.67);
+x.d // [ 12345, 6700000 ] digits (base 10000000)
+x.e // 4 exponent (base 10)
+x.s // -1 sign
+```
+
+For further information see the [API](http://mikemcl.github.io/decimal.js/) reference in the *doc* directory.
+
+## Test
+
+To run the tests using Node.js from the root directory:
+
+```bash
+npm test
+```
+
+Each separate test module can also be executed individually, for example:
+
+```bash
+node test/modules/toFraction
+```
+
+To run the tests in a browser, open *test/test.html*.
+
+## Minify
+
+Two minification examples:
+
+Using [uglify-js](https://github.com/mishoo/UglifyJS) to minify the *decimal.js* file:
+
+```bash
+npm install uglify-js -g
+uglifyjs decimal.js --source-map url=decimal.min.js.map -c -m -o decimal.min.js
+```
+
+Using [terser](https://github.com/terser/terser) to minify the ES module version, *decimal.mjs*:
+
+```bash
+npm install terser -g
+terser decimal.mjs --source-map url=decimal.min.mjs.map -c -m --toplevel -o decimal.min.mjs
+```
+
+```js
+import Decimal from './decimal.min.mjs';
+```
+
+## Licence
+
+[The MIT Licence (Expat).](LICENCE.md)