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That state flow is steered by records in I<%fst>.
Each record consists of:

=over

=item B<switch()> callback

This is some user supplied code that
always consumes whatever B<source()> callback returns (at some point in past),
(optionally) regurgitates said input,
and decides what I<[turn]> to go next.
Except when in special I<{state}> (see below) it's supplied with one argument:
I<$item>.
In special states I<$item> is missing.
B<switch()> returns two controls:  I<$rule> and processed I<$item>.
What to do with returned I<$item> is determined by I<$action> (see below).

=item various I<[turn]>s

Each I<[turn]> spec is an ARRAY with two elements (trailing elements are
ignored).