* ``sqlite3.enable_shared_cache()``

* ``sqlite3.OptimizedUnicode``

If a shared cache must be used, open the database in URI mode using the

``cache=shared`` query parameter.

The ``sqlite3.OptimizedUnicode`` text factory has been an alias for

:class:`str` since Python 3.3. Code that previously set the text factory to

``OptimizedUnicode`` can either use ``str`` explicitly, or rely on the

default value which is also ``str``.

(Contributed by Erlend E. Aasland in:gh:`92548`)

* The ``--experimental-isolated-subinterpreters`` configure flag