The example with typing.Protocol doesn't work with typehints.

[CaffeineDuck]

class IMailService(ty.Protocol):
    def send_mail(self, subject: str, to: str) -> None:
        ...

@inject_args_deps
def business_logic(mail_service=Injectable(IMailService)):
    mail_service.send_mail("Hello", "world") # type of mail_service: Injectable[IMailService]

class IMailService:
    def send_mail(self, subject: str, to: str) -> None:
        ...


@inject_args_deps
def business_logic(mail_service=Injectable(IMailService)):
    mail_service.send_mail("Hello", "world") # type of mail_service: IMailService

The second type is desirable, but it doesn't work when the Injectable class in a typing.Protocol.