Reading the Nov TC39 notes, looks like the performance issue was discussed and addressed by removing the pendingExeption bit from the spec, just throwing the
first exception when it occurs.

https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-19.md

(Presumably that's the reason lodash etc trump the Gecko impl, but I haven't
actually looked myself.)


https://codereview.chromium.org/548833002/

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