[ty] Correct return type for synthesized NamedTuple.new methods by bxff · Pull Request #22625 · astral-sh/ruff (original) (raw)

• Uses a synthetic Self type variable for __new__ in NamedTuple synthesis.
• Types the cls parameter as type[Self] and sets the return type to Self.
• This ensures that super().__new__ calls in subclasses correctly resolve to the subclass type, fixing astral-sh/ty#2522.
• Updated named_tuple.md assertions to match the new generic display and added a dedicated regression test case.

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