[issue36650] Cached method implementation no longer works on Python 3.7.3

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

It seems highly likely this is related to #26110 which optimizes method calls by avoiding the creation of bound methods in certain circumstances, and/or the follow-up #29263.

Side-note:

bound_method = functools.partial(method, self)

is not how you create real bound methods. The correct approach (that makes a bound method identical to what the interpreter makes when necessary) for your use case is:

bound_method = types.MethodType(method, self)

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nosy: +josh.r

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