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  strValue += "";      // Convert any digits to string
  if (! strValue) { strValue = "0"; }  // Convert empty string to 0
...

  // Add a leading 0 to any numbers starting with a decimal point
  if (strValue.match (/^\./)) { strValue = "0" + strValue; }

value|precision     sprintf   Incognito   Albannach       jeffa      r
+ob_au
 '123.45678'|3:     123.457     123.456     123.456         123     12
+3.457
...
      '1000'|5:  1000.00000  1000.00000  1000.00000       01000  1000.
+00000
     '12.56'|0:          13          12          12          12       
+   13