First overload picked overeagerly when overloading on self type

Consider this example:

from typing import Generic, TypeVar, Any, overload

AnyStr = TypeVar("AnyStr", str, bytes)

class Popen(Generic[AnyStr]):
    @overload
    def communicate(self: Popen[str], buf: str = ...) -> float: ...
    @overload
    def communicate(self: Popen[bytes], buf: memoryview | bytes = ...) -> range: ...
    def communicate(self, buf: object = None) -> Any: raise NotImplementedError

p = Popen()
reveal_type(p.communicate())

This currently reveals float. I think it should either be the union float | range or Any. This came up in python/typeshed#9100.

Start with the supplied Generic[Popen] example and reproduce the revealed type for communicate(). Trace overload resolution for methods overloaded on the self type, then compare the result with the expected float | range or Any behavior. Done means the example no longer reveals only float and regression coverage protects the corrected behavior.