I thought about using for, but how do I loop in this way over a hash, so that the key-value association is maintained? Of course I could do something like

for ([qw(key1 val1)],[qw(key2 val2)],....) {
  my $key=$_->[0];
  my $val=$_->[1];
  ...
}
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but this too is not quite a response to my original problem, which is, looping over a hash. Or maybe I misunderstood you? Could you give some example?