v4.1.4

Fixes

• Make sure copied Date properties remain non-enumerable.
• Using a more reliable check for supported property descriptors in non-IE ES3
• Fix 'constructor' in Object.defineProperties sham in ES3 (#252, #305)

Robustness

• Use a reference to Array#concat rather than relying on the runtime environment's concat.

Testing

• Test on io.js v2.1

Refactoring

• Clean up Array.prototype iteration methods