`configparser.RawConfigParser` stub does not account for non-string options

The stub for configparser.RawConfigParser.set has its value argument typed as str | None (source) when it can accept lots of other types and is leading to a false positive in mypy for me.

Consider this valid script:

from configparser import RawConfigParser

cfg = RawConfigParser()
cfg.add_section("default")

cfg.set("default", "some_option1", True)
r1 = cfg.get("default", "some_option1")
print(r1, type(r1))


cfg.set("default", "some_option2", 1)
r2 = cfg.get("default", "some_option2")
print(r2, type(r2))

cfg.set("default", "some_option3", b"bytes")
r3 = cfg.get("default", "some_option3")
print(r3, type(r3))

It prints:

True <class 'bool'>
1 <class 'int'>
b'bytes' <class 'bytes'>

However, mypy flags this code for the reason described above:

test.py:6: error: Argument 3 to "set" of "RawConfigParser" has incompatible type "bool"; expected "Optional[str]"
test.py:11: error: Argument 3 to "set" of "RawConfigParser" has incompatible type "int"; expected "Optional[str]"
test.py:15: error: Argument 3 to "set" of "RawConfigParser" has incompatible type "bytes"; expected "Optional[str]"

Empieza con stdlib/configparser.pyi alrededor de la línea 133 y compara la firma de RawConfigParser.set con el comportamiento mostrado en el issue. Ejecuta el script proporcionado con mypy para reproducir los falsos positivos y, después, verifica que los valores booleanos, enteros y bytes se acepten sin errores, mientras que el comportamiento existente de get siga estando cubierto.