[merge][rfc] small inventory apply_delta patch

[Robert Collins]

On Tue, 2008-11-11 at 03:50 -0600, John Arbash Meinel wrote:
> 
> 
> I believe we discussed it a bit here, and I agree with you. The
> thought
> I voiced here is that we probably want to get rid of mutating
> inventories in place. I think we've been trying to move away from
> operating on Inventories as a first-class object, to operating on
> Trees
> and having them hide the details of the Inventory underneath.

I think we want to be wary of introducing alias-related bugs while we do
this though. Also there is no conceptual problem IMO with RevisionTree
implementing its internals in terms of Inventory; the problem is when
Inventory becomes a defacto public interface.

-Rob

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