Actually ... i would desire this:
my $arg = shift || 'boo';
my @valid = qw( goo moo foo voo doo poo );
print "$arg matches\n" if grep /$arg/, @valid;
But this bring up an annoyance as well, because this mistake will compile and always return true (as long as the array being checked is not empty):
# wrong way ahead!
print "$arg matches\n" if grep $arg, @valid;
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