[issue32506] dataclasses: no need for OrderedDict now that dict guarantees to keep insertion order

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Library (Lib)
dependencies: +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/issue32506>
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