PEP 696: Add section on binding rules (#3427)

Author: Gobot1234

peps/pep-0696.rst

@@ -382,6 +382,21 @@ Function Defaults
 functions as ensuring the ``default`` is returned in every code path
 where the ``TypeVarLike`` can go unsolved is too hard to implement.
 
+Binding rules
+-------------
+
+``TypeVarLikes`` defaults should be bound by attribute access
+(including call and subscript).
+
+.. code-block:: python
+
+   class Foo[T = int]:
+       def meth(self) -> Self:
+           return self
+
+   reveal_type(Foo.meth)  # type is (self: Foo[int]) -> Foo[int]
+
+
 Implementation
 --------------