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* bpo-33018: Improve issubclass() error checking and message. (GH-5944)jab2018-03-221-0/+2
| | | | | This improves error message for situations when a non-class is checked w.r.t. an abstract base class.
* bpo-31333: Re-implement ABCMeta in C (#5273)Ivan Levkivskyi2018-02-181-0/+145
This adds C versions of methods used by ABCMeta that improve performance of various ABC operations.