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In response to Serhiy's comment regarding __copy__ etc.: while the
distinction is somewhat unfortunate, I think it's too late to make this
more consistent. I think it's fine that the special methods used by copy
and pickle protocols behave somewhat differently -- that's a totally
different area anyways (and not directly supported by the core language).
In contrast, __hash__, __iter__, __contains__, __reversed__, __iadd__ etc.
are much more core to the language (representing either builtin functions
or operations). Plus here we really need a way to signal the difference
between "not defined here so fall back on either a superclass or a
different protocol" and "defined here as not existing so cause an error
when used". So I don't think there's anything actionable here.