But why is this better than the version using return? (and we don't care between no-stored and not-found :-). Why are returns bad?
We just seem to be adding three more exception classes, moving the logic of what we care and don't care about handling from the mainline to the catch block, and making the caller handle exceptions when they're just interested in a boolean value. How is this simpler? All the callers of find are now going to have to do:
eval { $self->find($foo) };
print "found" if ( UNIVERSAL::isa($@, 'Signal::Search::Found') );
die $@ unless UNIVERSAL::isa($@, 'Signal::Search');
# rather than
print "found" if $self->find($foo);
which seems insane - but ignoring that point what is wrong with the return? That's the bit I'm not getting.
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