v4.1.10

Fixes (shim)

• Fix IE 8 issue with window.frameElement access in a child iframe (#322)

Tests

• Consolidating Date.parse extended year tests
• Account for a Date.parse precision variance in Safari 8
• DRY up some Date.parse tests
• Don't create globals in Date tests
• Better failure output when an invalid date's toJSON throws
• Also compare lengths of array-likes
• Extra check on Object.keys(arguments)
• Skip appropriate tests when objects aren't extensible/freezeable/sealable