What to do about 'revid in ancestry' checks.

[Aaron Bentley]

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Robert Collins wrote:
> There are multiple places in bzr which do set inclusion tests like
> 'if rev_id in ancestry'
> where ancestry is obtained by Repository.get_ancestry.
> 
> To avoid scaling problems this needs to be delegated to the repository
> index, *or* get_ancestry has to return a smart/lazy set object.

I think set inclusion tests are pretty clearly the domain of the Graph
object, actually.  Doesn't that make sense to you?

Aaron
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