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Heading translation in `sed`

The other missing feature is that it treats all repeated characters like underlines

The Perl program didn't

          I am a heading
          **************

          I am NOT a heading
          **************

          I am not a heading either
          ************************************

Perl handled this:

          if (/^(.)\1+$/ && defined($held) && length($_) == length($held)) {

sed has no (easy) way to compare the lengths of two strings