Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
Sorry, I was wrong. reversed() is not needed here.
The advantage of this implementation is that it can be faster because of
iterating mappings in C code instead of Python code. But the side effect of it
is that the iterator keeps references to all values. If this is not desirable,
the code can be written something like:
return iter(dict.fromkeys(itertools.chain.from_iterable(self.maps)))
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<https://bugs.python.org/issue32792>
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