no error when method has a keyword argument but no positional arguments

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class A:
    def __init__(*, self) -> None:
        ...


a = A() # runtime error - TypeError: A.__init__() takes 0 positional arguments but 1 was given

https://mypy-play.net/?mypy=latest&python=3.10&flags=show-error-context%2Cshow-error-codes%2Cstrict%2Ccheck-untyped-defs%2Cdisallow-any-decorated%2Cdisallow-any-expr%2Cdisallow-any-explicit%2Cdisallow-any-generics%2Cdisallow-any-unimported%2Cdisallow-incomplete-defs%2Cdisallow-subclassing-any%2Cdisallow-untyped-calls%2Cdisallow-untyped-decorators%2Cdisallow-untyped-defs%2Cno-implicit-optional%2Cno-implicit-reexport%2Clocal-partial-types%2Cstrict-equality%2Cwarn-incomplete-stub%2Cwarn-redundant-casts%2Cwarn-return-any%2Cwarn-unreachable%2Cwarn-unused-configs%2Cwarn-unused-ignores&gist=277209387a38676912bf8ab2079a1c47