The command !set_superuser won't work

[russian-developer]

bot/app/handlers/superuser.py

Line 9 in 5d892a2

@dp.message_handler(commands=["set_superuser"], commands_prefix="!", is_superuser=True)

In the first lines of the function above, you check the user_id is existed by calling get_args method of the message. The check always returns false.
The method message.get_args() returns an argument only if it command that starts with /.

Trace:
message.get_args() -> message.get_full_command() -> message.is_command() -> return self.text and self.text.startswith("/")