Essentially the same as https://bugs.python.org/issue29581 (more detail is there), but for the additional meta-classes enum.EnumMeta and probably typing.NamedTupleMeta (discussion needed - is there a use-case for this?)
The __new__ method on these metaclasses should include **kwargs at the end of the method definition and pass them on to the super call in order to allow the special method __init_subclass__ to be defined with custom parameters on classes using the metaclass.
(also, perhaps the issue for typing should be reported separately on github python/typing instead)
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