Stefan Behnel added the comment:

-1 on any changes that make the specific C-API functions less specific. They 
are perfectly adequate for gaining speed in well defined situations.

+0 on any changes that special case concrete types in abstract calls if they 
prove to be worth the hassle.

+1 for making sure CPython does not accidentally exclude subclasses internally 
for anything that's provided by users.

+1 on CPython being the wrong place to work around this for external code. If 
extensions use the wrong function, *they* must be fixed. At most, there might 
be a documentation issue hidden here.

Also, we should be careful with adding yet another substantial set of C-API 
functions. It's not clear to me that they are really needed in practice.

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nosy: +scoder

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10977>
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