[MERGE] Use slots consistently in InventoryEntry hierarchy -- update

[Robert Collins]

On Wed, 2006-06-07 at 21:03 +0200, Jan Hudec wrote:
> 
> > There should be no attribute on class or instance for e.g.
> > symlink_target except on InventoryLink.
> 
> That's what the previous version of the patch did. And I got complaint
> that
> it shouldn't be checking for the kind. So I tried this, because
> benchmarking says it's faster than checking with hasattr or try/catch.

The right approach is to only *attempt* to access those attributes when
they are guaranteed to exist.

Rob

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