David Robertson 3b0083c92a
Use immutabledict instead of frozendict (#15113)
Additionally:

* Consistently use `freeze()` in test

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Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: 6543 <6543@obermui.de>
2023-03-22 17:15:34 +00:00
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2023-02-16 16:09:11 +00:00