[PATCH 1 of 2] revlog: add __contains__ for fast membership test

[Gregory Szorc]

diff --git a/mercurial/changelog.py b/mercurial/changelog.py

> --- a/mercurial/changelog.py
> +++ b/mercurial/changelog.py
> @@ -143,6 +143,11 @@ class changelog(revlog.revlog):
>              if i not in self.filteredrevs:
>                  return self.node(i)
>
> +    def __contains__(self, rev):
> +        """filtered version of revlog.__contains__"""
> +        return (revlog.revlog.__contains__(self, rev)
> +                and rev not in self.filteredrevs)
> +
>

What you've implemented here is changelog.hasunfilteredrev(). I'm not
convinced __contains__ should be implemented:

a) to only accept numeric revisions (what about nodes)
b) to only operate on unfiltered revs

"a" applies to revlog.__contains__ as well.
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