[MERGE] Implement annotation for knits with no annotation cache

[Robert Collins]

On Sun, 2007-09-02 at 18:22 -0400, Aaron Bentley wrote:
> 
> Sure.  I can change it to use the topo_sorted ancestry.

Thanks - that should make your loop simpler :).

> It's mainly historical raisins.  I do think it would be a good idea to
> have cached annotations somewhere, and those could be used to avoid
> building the whole topo-sorted ancestry.

Agreed.

> Also, I think that topological sorting is a bad default behavior,
> because many callers do not need this information to be sorted.  And
> that would reduce the amount of data needed quite a lot.  So I always
> write topo_sorted=False by default. 

Thats fair enough, though a topo sorted index will actually faster
overall if you ask for topo sorted ancestry and use it than asking for
non-topo-sorted and then sort it yourself.

:).

-Rob

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