>   I think it would make sense to defer the behavior change until we test some 
> more. That said, I do want us to plan to make an intentionally breaking 
> change with the out of the box grep experience *without* `tweakdefaults` 
> enabled. My reasoning is more or less this: approximately nobody uses `hg 
> grep` today[0] because its behavior doesn't match what users expect out of 
> the box. I'm willing to call the current behavior a *bug*, and prominently 
> announce that with 4.8 we expect to change the default behavior of `hg grep` 
> to match user expectations. That's in line with the decision outlined in [1] 
> which is old enough that mpm was part of the decision. I strongly suspect 
> hglib will be the only meaningful breakage, and we can patch hglib to pass 
> the -r 0:tip flag that'll give consistent behavior across all hg versions.

If we can take the current `hg grep` behavior as a bug, we can say the
same thing for python-hglib. I don't want to make hglib grep diverged from
hg one since hglib is a thin wrapper.
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