thanks, I eventually used your solution, with a minor modification:
sub isequal {
return 0 if ( grep { ! defined( $_ ) } @_ ) == scalar @_;
no warnings qw/uninitialized/;
my %gadget;
@gadget{ @_ } = ();
return scalar keys %gadget == 1 ? 1 : 0;
}
(changed the != into a == in the first line in the function)
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