use Number.isInteger instead of bitwise operation (#606)

* use Number.isInteger instead of bitwise operation

* add test

Author: Uzlopak

lib/serializer.js

@@ -27,7 +27,7 @@ module.exports = class Serializer {
       if (i === Infinity || i === -Infinity) {
         throw new Error(`The value "${i}" cannot be converted to an integer.`)
       }
-      if ((i | 0) === i) {
+      if (Number.isInteger(i)) {
         return '' + i
       }
       if (Number.isNaN(i)) {

test/integer.test.js

@@ -45,6 +45,7 @@ test('render a float as an integer', (t) => {
     { input: 42, output: '42' },
     { input: 1.99999, output: '1' },
     { input: -45.05, output: '-45' },
+    { input: 3333333333333333, output: '3333333333333333' },
     { input: Math.PI, output: '3', rounding: 'trunc' },
     { input: 5.0, output: '5', rounding: 'trunc' },
     { input: null, output: '0', rounding: 'trunc' },