def METHOD_NAME(page_or_revision, block_path, data, mapper):
    if not block_path:
        return data, False
    if isinstance(block_path, str):
        block_path = [
            block_path,
        ]
    elif isinstance(block_path, tuple):
        block_path = list(block_path)
    return migrate_streamblock(page_or_revision, block_path, data, mapper)