remove Number from the list of valid runtime constructors - fixes #981

CHANGELOG.md

@@ -18,6 +18,7 @@ See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
  * **Bug Fix**
   * Rewrite named function expressions in optional async function transformers.
   * Hoist directives.
+  * Remove `Number` from the list of valid `runtime` constructors.
  * **Internal**
   * `spec.typeofSymbol` transformer has been renamed to `es6.symbols`.
 

src/babel/transformation/transformers/other/runtime.js

@@ -16,8 +16,7 @@ var ALIASABLE_CONSTRUCTORS = [
   "Map",
   "WeakMap",
   "Set",
-  "WeakSet",
-  "Number"
+  "WeakSet"
 ];
 
 var astVisitor = {