py/runtime: Fix self arg passed to classmethod when accessed via super. #15533
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Summary
MicroPython was not conforming to CPython behaviour when using
super()
within aclassmethod
. This patch fixes this behaviour.Testing
New test added which did not pass before, but now passes.
Thanks to @AJMansfield for the original test case.
Trade-offs and Alternatives
This increases code size a little bit, but if not fixed it can lead to some very difficult to debug problems, if you even notice there's a problem in the first place.