sqlite3.Cursor.fetchone may return an object returned by row_factory

# Documentation

https://github.com/python/cpython/blob/9a11ed8e50492d327e4de0a8f3a473e788b14a6f/Doc/library/sqlite3.rst#L1426-L1429


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	.. method:: fetchone()

	Return the next row of a query result set as a :class:`tuple`.
	Return ``None`` if no more data is available.