We already tried to ship Array.prototype.values before in Firefox 48,
but this broke
Microsoft Dynamics CRM 2011
(https://bugzilla.mozilla.org/show_bug.cgi?id=1299593). We are however
aware this might have caused other breakages as well.

The compatibility risk for this change is high.
However Chrome is going to try shipping this again (third time!)

Edge and Safari already ship this feature.

Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1420101

Any additional ideas how to mitigate the risk here? Chrome seems to
want to add a kill pref for this,  from my experience more difficult
for us with the way we define methods in SpiderMonkey. Should that be
a requirement for shipping?
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