* it returns is "s". For values in [-499..499] this returns "  0 µs".
 *
 * The returned string attempts to be column-aligned to 6 characters. For negative and large values
 * the returned string may be longer.
 */
fun formatDuration(ns: Long): String {
  val s =
    when {
      ns <= -999_500_000 -> "${(ns - 500_000_000) / 1_000_000_000} s "

1F17F         ; valid                  ;      ; NV8    # 5.2  NEGATIVE SQUARED LATIN CAPITAL LETTER P
1F180..1F189  ; valid                  ;      ; NV8    # 6.0  NEGATIVE SQUARED LATIN CAPITAL LETTER Q..NEGATIVE SQUARED LATIN CAPITAL LETTER Z

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