Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

The code in msg311969 doesn't reuse hash values. The following implementations 
do this:

    return iter({**m for m in reversed(self.maps)})

or, without keeping reverences to values:

    return iter(list({**m for m in reversed(self.maps)}))

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32792>
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