Rationalizing Python's APIs

CPython is the reference implementation of Python, so it is, unsurprisingly, the target for various language-extension modules. But the API and ABI it provides to those extensions ends up limiting what alternative Python implementations—and even CPython itself—can do, since those interfaces must continue to be supported. Beyond that, though, the interfaces are not clearly delineated, so changes can unexpectedly affect extensions that have come to depend on them. A recent thread on the python-ideas mailing list looks at how to clean that situation up.

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