(🐞) `type.__call__` not checked properly

class A:
    def __init__(self, x: int):
        print(x)

A.__call__("a")  # no error
A("a")  # Argument 1 to "A" has incompatible type "str"; expected "int"  [arg-type]

The typing spec says:

At runtime, a call to a class’ constructor typically results in the invocation of three methods in the following order:

1. The __call__ method of the metaclass (which is typically supplied by the type class but can be overridden by a custom metaclass and which is responsible for calling the next two methods)

So mypy is checking that usages of the call syntax (()) are conforming to the constructor type, but the functionally identical call attribute __call__. This is against the spec, which specifies that type checkers should mirror the behavior that __call__ will invoke __new__ and __init__

Empieza por el tratamiento que hace mypy de las llamadas al constructor y de las llamadas mediante atributo a type.__call__, usando como reproducción el ejemplo del issue. Sigue cómo se comprueba A("a") frente a A.__call__("a"), y añade cobertura que demuestre que ambas formas hacen cumplir el tipo del argumento del constructor.