diff performance & tree.lock/unlock

[Aaron Bentley]

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John Arbash Meinel wrote:
> I would say that lock_write() to something readonly should raise a
> not-possible exception.

I think it's appropriate to assume that calling code will not supply a
revision tree to any function that needs to write to a tree.  The two
are qualitatively different, and I think the WorkingTree interface
should be a superset of the Tree interface.

So I'd favour taking the method out.

Aaron

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