New submission from Serhiy Storchaka:

Iterating ChainMap emits keys in mixed order even if all underlying mappings 
are ordered dicts (OrderedDict). Would be nice to keep the order more 
predictable.

This would solve issue30664. See also issue30689.

----------
components: Library (Lib)
messages: 296237
nosy: eric.smith, rhettinger, serhiy.storchaka
priority: normal
severity: normal
status: open
title: ChainMap doesn't preserve the order of ordered mappings
type: enhancement
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30690>
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