Poppycock! It has a default:

# create a new Fuzzy Matcher. This mostly deals with
# alphabet/character type issues. The trie we build
# needs this info. Uppercase and lowercase letters
# are treated as the same character.

sub _init {
  my ($self,$chars)=@_;

  $chars='ACGT' unless defined $chars;
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I used it.

That it doesn't detect and report and that I am passing data outside of that alphabet, is a design flaw, which can be corrected and about which I did not comment.

That it has this limitation, that neither of the others do, and that this limitation isn't noted alongside your big, dramatic table is the point.

I haven't bothered reading the rest of your diatribe:

Burying your head?

Falsus in uno, falsus in omnibus.

What that about screaming in falsetto?