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## Summary I found this bug while working on #18041. The following code leads to infinite recursion. ```python from ty_extensions import is_disjoint_from, static_assert, TypeOf class C: @property def prop(self) -> int: return 1 static_assert(not is_disjoint_from(int, TypeOf[C.prop])) ``` The cause is a trivial missing binding in `is_disjoint_from`. This PR fixes the bug and adds a test case (this is a simple fix and may not require a new test case?). ## Test Plan A new test case is added to `mdtest/type_properties/is_disjoint_from.md`.