[issue10977] Concrete object C API needs abstract path for subclasses of builtin types

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I added a few commments on Daniel's draft patch. However, I'm getting nervous about the performance impact of all these extra pointer comparisons.

We should probably hold off on this until more of the macro benchmark suite runs on Py3k so we can get as hint as to the possible speed impact on real application code.

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