my %results = map { $_ => 1 if ( $low_watermark < $_ && $_ < $high_watermark ) } @all_numbers;
will get all of the matching numbers
Not if any of the numbers are duplicates because you are storing them in hash keys which will remove duplicates.
Why not just:
my @results = grep $low_watermark < $_ && $_ < $high_watermark, @all_n
+umbers;
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