@classmethod
def get_schema_version(cls, bytes):
    """
        Get the appropriate ``SchemaVersion`` for the specified
        serialized HLL.

        :param list bytes: the serialized HLL whose schema version is desired.

        :returns the schema version for the specified HLL. This will never be ``None``.
        :rtype: SchemaVersion
        """
    version_byte = bytes[0]
    schema_version_number = cls.schema_version(version_byte)
    return cls.get_schema_version_from_number(schema_version_number)
