[issue28183] Clean up and speed up dict iteration

[Raymond Hettinger]

Raymond Hettinger added the comment:

We can still clean this up for Python 3.6.  We're in feature freeze, not development freeze.  The compact dict patch was very rough when it landed and is expected to continue to be polished so that the expected benefits are realized.

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versions: +Python 3.6 -Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28183>
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