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[ty] cache Type::is_redundant_with (#20477)

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Co-authored-by: Micha Reiser <micha@reiser.io>
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
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Carl Meyer 2025-10-16 04:46:56 -07:00 • committed by GitHub
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11
crates/ty_python_semantic/resources/mdtest/pep695_type_aliases.md
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@ -360,3 +360,14 @@ type X = tuple[X, int]
def _(x: X):
reveal_type(x is x) # revealed: bool
```
### Recursive invariant
```py
type X = dict[str, X]
type Y = X | str | dict[str, Y]
def _(y: Y):
if isinstance(y, dict):
reveal_type(y) # revealed: dict[str, X] | dict[str, Y]
```