Bytes literals
Simple
reveal_type(b"red" b"knot") # revealed: Literal[b"redknot"]
reveal_type(b"hello") # revealed: Literal[b"hello"]
reveal_type(b"world" + b"!") # revealed: Literal[b"world!"]
reveal_type(b"\xff\x00") # revealed: Literal[b"\xff\x00"]