fix Safari 9 JSON.parse bug with handling negative zero + some whitespaces

Author: zloirock

CHANGELOG.md

@@ -30,7 +30,7 @@
 - `Number.range` Stage 1 proposal and method [renamed to `Iterator.range`](https://github.com/tc39/proposal-Number.range)
 - `Function.prototype.unThis` Stage 0 proposal and method [renamed to `Function.prototype.demethodize`](https://github.com/js-choi/proposal-function-demethodize)
 - Improved some cases handling of array-replacer in `JSON.stringify` symbols handling fix
-- Fixed many other old `JSON.{ parse, stringify }` bugs (numbers instead of strings as keys in replacer, handling negative zeroes, some more handling symbols cases, etc.)
+- Fixed many other old `JSON.{ parse, stringify }` bugs (numbers instead of strings as keys in replacer, handling negative zeroes, spaces, some more handling symbols cases, etc.)
 - Fixed configurability and `ToString` conversion of some accessors
 - Added Opera Android 73 compat data mapping
 - Added TypeScript definitions to `core-js-builder`

packages/core-js/modules/esnext.json.parse.js

@@ -240,17 +240,22 @@ Context.prototype = {
 var NO_SOURCE_SUPPORT = fails(function () {
   var unsafeInt = '9007199254740993';
   var source;
-  JSON.parse(unsafeInt, function (key, value, context) {
+  nativeParse(unsafeInt, function (key, value, context) {
     source = context.source;
   });
   return source !== unsafeInt;
 });
 
+var PROPER_BASE_PARSE = NATIVE_SYMBOL && !fails(function () {
+  // Safari 9 bug
+  return 1 / nativeParse('-0 \t') !== -Infinity;
+});
+
 // `JSON.parse` method
 // https://tc39.es/ecma262/#sec-json.parse
 // https://github.com/tc39/proposal-json-parse-with-source
 $({ target: 'JSON', stat: true, forced: NO_SOURCE_SUPPORT }, {
   parse: function parse(text, reviver) {
-    return NATIVE_SYMBOL && nativeParse && !isCallable(reviver) ? nativeParse(text) : $parse(text, reviver);
+    return PROPER_BASE_PARSE && !isCallable(reviver) ? nativeParse(text) : $parse(text, reviver);
   }
 });