[issue31954] Don't prevent dict optimization by coupling with OrderedDict

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

PR 4901 implements Inada's idea about changing dk_lookup to an index. This decreases the size, but can have negative performance effect (I didn't make benchmarks).

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<https://bugs.python.org/issue31954>
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