Number: wrapConstructor requires true ES5.

Fixes part of #365.
paulmillr · Oct 22, 2015 · 238c77a · 238c77a
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diff --git a/README.md b/README.md
@@ -44,6 +44,7 @@ In both browser and node you may also want to include `unorm`; see the [`String.
 * `RegExp.prototype`:
     * `flags` (requires ES5) ([a standalone shim is also available](https://github.com/es-shims/RegExp.prototype.flags))
 * `Number`:
+    * binary and octal literals: `Number('0b1')` and `Number('0o7')` (requires ES5 property descriptor support)
     * `EPSILON`
     * `MAX_SAFE_INTEGER`
     * `MIN_SAFE_INTEGER`

diff --git a/es6-shim.js b/es6-shim.js
@@ -1132,7 +1132,7 @@
     }, true);
   }
 
-  if (Number('0o10') !== 8 || Number('0b10') !== 2) {
+  if (supportsDescriptors && (Number('0o10') !== 8 || Number('0b10') !== 2)) {
     var OrigNumber = Number;
     var binaryRegex = /^0b/i;
     var octalRegex = /^0o/i;