Various small improvements to recursive normalizers#2378

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poodlewars wants to merge 8 commits intomasterfrom

aseaton/enhancement/9236599289/double-underscore-recursive-norm

Commits on Jun 13, 2025

Do not merge: Non-Recursive implementation to create the flattener's metastructure
poodlewars
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Revert "Do not merge: Non-Recursive implementation to create the flattener's metastructure"
poodlewars
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Remove TODO to make create_meta_structure non-recursive
poodlewars
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Update comment about pickle_on_failure
poodlewars
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Give clean error when data is too heavily nested
poodlewars
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Recursive normalizers: Validate against the separator appearing in dict keys
poodlewars
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Recursive normalizers: Support wider range of dict keys - that would not be supported as symbol names
poodlewars
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Recursive normalizers: Fix regressions caught by CI
poodlewars
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