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Doing it everywhere would be a lot of painful changes.

Adding the "oops, failed, call gc and try again" to to 
PyMem_* (currently PyMem_Malloc, PyMem_Realloc, PyMem_New, 
and PyMem_Resize, but Brett may be changing that) is far 
more reasonable.

Whether it is safe to call gc from there is a different 
question.