[Cross-post from Discourse] Changing runtime behavior of types.UnionType to respect order in equality and hashing

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Please see the following Discourse thread:

](https://discuss.python.org/t/changing-runtime-behavior-of-types-uniontype-to-respect-order-in-equality-and-hashing/26071)

Thank you.

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Resolved: we are not changing unions. We are changing the typing cache.