[Python-3000] Another generic functions/adaptation use case

[Nick Coghlan]

Another potential generic function use case that occurred to me is the open() 
builtin.

If that was extensible, the discussion about providing a nice filesystem path 
abstraction in the standard lib wouldn't need to waste any time on the 
question of whether or not to inherit from unicode - it would just register a 
new open() signature for path objects.

Ditto for if we later added objects to represent URLs/URIs.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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