How do you test shortcut using period (".") or comma (",") in combination such as {Shift>}{Alt>}.{/Alt}{/Shift}

Question

Trying to test a key combo of Shift + Alt + . and also Shift + Alt + , and I am not able to detect those at all. Shift + Alt + ArrowLeft or Shift + Alt + ArrowRight work perfectly e.g:

await act(
    async () =>
        await user.keyboard('{Shift>}{Alt>}{ArrowRight}{/Alt}{/Shift}'),
);

Looking at the source code it appears those are maybe not handled?