New low-level filtering

[v]

Matt Mackall wrote
> Mercurial has always had a fast, numbered index of all changes. It can
> find any change instantly, by hash or by number. There is no existing
> notion of an "unreachable changeset" in Mercurial. So hiding change 1000
> from Mercurial is thus not trivial: code expects that there's a
> changeset between 999 and 1001.

Where is this random-access to changesets (without a pointer from another
changeset) actually useful? (Read the code would be an acceptable answer, if
someone can point to code that needs this ...)



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