why does has_same_location check the class?

[Robert Collins]

On Wed, 2007-08-29 at 11:51 +1000, Martin Pool wrote:
> 
> Also, at the moment Repository, Branch, WorkingTree are all subclasses
> of object.  There is some common behaviour between them that could
> usefully be split into a base class, maybe called "Component" (of a
> BzrDir).  Any comments, objections, or better names?

What behaviour ?

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