Converts any complicated conditional dispatch situation into familiar static hash-key based dispatch

Changes for 1.00

• fixed a bug revealed when running C<dispatch> in a loop on 5.36.0 ( 4.19.0-25-amd64 #1 SMP Debian 4.19.289-1 (2023-07-24)) during testing of code presented in a Perl Advent article; thanks Olaf!