https://discuss.python.org/t/pep-747-typeexpr-type-hint-for-a-type-expression/55984?page=5
PEP 747: TypeExpr: Type Hint for a Type Expression - Page 5 - Typing - Discussions on Python.org
Jul 29, 2025 - TypeExpr[] (formerly TypeForm[]) is a new way to spell variables that hold type expression objects at runtime. They are similar to type[] class objects, but...