paulmillr/Array.prototype.findIndex — pull request #4 by ljharb (2014-08-07 03:10:06+00:00)
Title: Array#find and Array#findIndex no longer skip holes

Per https://bugs.ecmascript.org/show_bug.cgi?id=3107.

Also shipped in https://github.com/paulmillr/es6-shim/issues/280