I think there are the following distinct threads of discussion going on at the moment:
* Details of what should be in PEP 246
* Discussions spinning off from Guido's type-declaration-as-adaptation proposal
My understanding was that the first needed to be considered in context of the second, since it was the second which gave an implicit blessing to the first. PEP 246 had languished in relative obscurity for a long time until Guido's blessing it for type declarations brought it back into the spotlight. So, I thought it important to frame its discussion in terms of its use for type declaration.
* Discussion of what counts as a "good" adapter
Alex was originally trying to add to PEP 246 some recommendations regarding "good" vs. "bad" adaptation, so this is actually part of "what should be in PEP 246"
* Philip's new generic function / ducy typing proposals
And of course this one is an attempt to unify everything and replace PEP 245 (not 246) with a hopefully more pythonic way of defining interfaces and adapters. I hope to define a "relatively safe" subset of PEP 246 for type declarations that can be done automatically by Python, in a way that's also conceptually compatible with COM and Java casting (possibly making Jython and IronPython's lives a little easier re: type declarations).
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