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R = TypeVar("R", bound=Callable)

class Resolvers(Register[Type[ParameterSpecificafion], Optional[R]]):
    pass

class MyManager(ParameterManager):
    resolvers = {Param: None}

@dataclass
class Header(ParameterSpecification):
    name: str

composers = Composers()

@composers(Header)
def compose_header(func: Callable, parameter: Parameter[Header], value: Any) -> Any:
    ...

T_contra = TypeVar("T_contra", contravariant=True)
U_contra = TypeVar("U_contra", contravariant=True)

class BiConsumer(Protocol[T_contra, U_contra]):
    def __call__(self, t: T_contra, u: U_contra, /) -> None:
        ...