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## Summary This is to support https://github.com/astral-sh/ruff/pull/18607. This PR adds support for generating the top materialization (or upper bound materialization) and the bottom materialization (or lower bound materialization) of a type. This is the most general and the most specific form of the type which is fully static, respectively. More concretely, `T'`, the top materialization of `T`, is the type `T` with all occurrences of dynamic type (`Any`, `Unknown`, `@Todo`) replaced as follows: - In covariant position, it's replaced with `object` - In contravariant position, it's replaced with `Never` - In invariant position, it's replaced with an unresolved type variable (For an invariant position, it should actually be replaced with an existential type, but this is not currently representable in our type system, so we use an unresolved type variable for now instead.) The bottom materialization is implemented in the same way, except we start out in "contravariant" position. ## Test Plan Add test cases for various types. |
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