[PATCH STABLE] revlog: add an experimental option to mitigated delta issues (issue5480)

[Augie Fackler]

> On Jul 3, 2017, at 4:53 PM, Gregory Szorc <gregory.szorc at gmail.com> wrote:
> 
>> > That's fair. I was on the fence about this anyways. Though, I did like
>> > that _something_ would make these repos usable. I just noticed that the
>> > commit has been marked public; don't know how strongly you feel about
>> > this so up to you on how to proceed.
>> 
>> I agree this is unsuitable for stable. How do we want to proceed?
>> 
>> (I'll hold the 4.2.2 release until we get consensus here.)
> 
> I think we should back out from stable and re-land on default. The feature is appropriate for default, even with the noted pitfalls.

I’ve grafted the commit to default, pushed a backout to stable, and merged with i18n. I’ll probably roll the release sometime this afternoon.