I talked to   Jan de Mooij and it's feasible to add a pref for this,
so we are definitely going to do this.

Array.prototype.values has always been enabled on Nightly. Based on
where the breakage occurred, internal company webpages, I would not
expect EARLY_BETA_OR_EARLIER to shake out any additional problems.

On Fri, Feb 2, 2018 at 4:17 PM, Mike Taylor <mi...@mozilla.com> wrote:
> On Feb 2, 2018, at 7:45 AM, Tom Schuster <t...@schuster.me> wrote:
>> 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?
> Add a pref enabling it for EARLY_BETA_OR_EARLIER, and false otherwise, and 
> let’s see what Nightly/Beta shakes out for a few releases. Then we have time 
> to attempt outreach or other such hacks before burning our release users.
> --
> Mike Taylor
> Web Compat, Mozilla
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