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value|precision     sprintf   Incognito   Albannach       jeffa
 '123.45678'|3:     123.457     123.456     123.456         123
      '12.4'|1:        12.4        12.4        12.4          12
...
        '3.'|0:           3           3           3           3
      '1000'|5:  1000.00000  1000.00000  1000.00000       01000
     '12.56'|0:          13          12          12          12

use strict;
#use warnings; # sprintf doesn't like nulls as values

...
  return $str if $add < 1;
  return ('0' x $add) . $str . $right;
}