[MERGE] RevisionSpec.as_revision_id()

[Aaron Bentley]

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Lukáš Lalinský wrote:
> If I remember correctly, I did this to avoid reading of revision-info in
> _check_history_violation if the revision info is cached. Not a big real
> in local branches, but in a checkout it means an extra network roundtrip
> for nothing.

Ah, cool.

Maybe the best way to handle this would be to have an _update_cache
method to use in place of clearing the cache.

Aaron
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