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

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

> I started to add this comment to #33218 but Raymond closed that ticket while I was editing it.

Sorry, I closed it, not Raymond.

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<https://bugs.python.org/issue32337>
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