v4.1.9

Fixes

• Remove "extended", add "unicode" in String#split shim, to match ES6
• Object.keys: Preserve the IE 8 dontEnum bugfix, and the automation equality bugfix.
• Object.keys: Prevent a deprecation message from showing up in Chrome.

Performance

• Speed up blacklisted key check for Object.keys automation equality bug.

Tests

• Test on io.js v2.4

Dev Deps

• Update eslint, semver