my $add_3_things = arbitrary_operator_maker('+', 3);

$add_3_things internally looks like:
sub {
  $_[0] + $_[1] + $_[2]
}

my $xor_5_things = arbitrary_operator_maker('^', 5);

$xor_5_things internally looks like:
sub {
  $_[0] ^ $_[1] ^ $_[2] ^ $_[3] ^ $_[4]
}