[issue32337] Dict order is now guaranteed, so add tests and doc for it

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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title: Dict order is now guaranteed, so add tests for it -> Dict order is now guaranteed, so add tests and doc for it

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32337>
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