How to use the mashumaro.abc.SerializableByteString function in mashumaro

self.x = {}

    @classmethod
    def from_mapping(cls, mapping):
        inst = cls()
        inst.x = {**mapping}
        return inst

    def to_mapping(self):
        return self.x

    def __repr__(self):
        return f"CustomSerializableMapping({str(self.x)})"


class CustomSerializableBytes(bytes, SerializableByteString):
    def __init__(self):
        super().__init__()
        self.x = bytes()

    @classmethod
    def from_bytes(cls, data: bytes):
        inst = cls()
        inst.x = bytes(data)
        return inst

    def to_bytes(self):
        return self.x

    def __repr__(self):
        return f"CustomSerializableBytes({str(self.x)})"

self.x = bytes()

    @classmethod
    def from_bytes(cls, data: bytes):
        inst = cls()
        inst.x = bytes(data)
        return inst

    def to_bytes(self):
        return self.x

    def __repr__(self):
        return f"CustomSerializableBytes({str(self.x)})"


class CustomSerializableByteArray(bytes, SerializableByteString):
    def __init__(self):
        super().__init__()
        self.x = bytearray()

    @classmethod
    def from_bytes(cls, data: bytes):
        inst = cls()
        inst.x = bytearray(data)
        return inst

    def to_bytes(self):
        return bytes(self.x)

    def __repr__(self):
        return f"CustomSerializableByteArray({str(self.x)})"