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Avoid type size explosion when expanding types (#17842)
If TypedDict A has multiple items that refer to TypedDict B, don't duplicate the types representing B during type expansion (or generally when translating types). If TypedDicts are deeply nested, this could result in lot of redundant type objects. Example where this could matter (assume B is a big TypedDict): ``` class B(TypedDict): ... class A(TypedDict): a: B b: B c: B ... z: B ``` Also deduplicate large unions. It's common to have aliases that are defined as large unions, and again we want to avoid duplicating these unions. This may help with #17231, but this fix may not be sufficient.
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