Support indirect definition references #1130
Merged
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This makes certain usage patterns work better in pydantic, e.g., making TypeAliasType references to other TypeAliasType's. I think we may want to optimize out reference chains at some point, but I don't think that should stop us from merging this now since this only makes more schemas acceptable, and doesn't affect any existing use of Pydantic (and the Pydantic PR I will open that makes use of this won't affect any currently-working usage, it will just allow some schemas that currently would raise schema-building errors).