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(as returned by B<source()>).
I<switch()> isn't invoked -- I<$item> is void, there's nothing to call
I<switch()> with.
However, I<$action> may change I<$item>.

=item C<uturn>

That I<[turn]> will be choosen by FSM if I<$rule> is C<undef>
(as returned by B<switch()>).
Idea behind this is to give an FST an option to bailout.
In original B<DMA::FSM> that's not possible (except B<croak>ing, you know).
Also, see L<B<BUGS AND CAVEATS>|/Perl FALSE, undef, and uturn>.

=item C<tturn> and/or C<fturn>

If any (hence 'or') is present then I<$rule> returned by B<switch()> is
treated as Perl boolean, except C<undef> it's handled by C<uturn>.
That's how it is in original B<DMA::FSM>.
If B<switch()> always returns TRUE (or FALSE) then C<fturn> (or C<tturn>) can
be missing.
Also, see L<B<BUGS AND CAVEATS>|/tturn, fturn, and switch()>.

=item C<turns>

If neither C<tturn> nor C<fturn> is present then whatever I<$rule> would be
returned by B<switch()> is treated as string.
That string is supposed to be a key in I<%$turns>.
I<$rule> returned is forced to be string (so if you dare to return objects,