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if (!Number.my_leftZeroPad) {
   Number.prototype.my_leftZeroPad = function(numZeros) {
      var n = Math.abs(this);
      var zeros = Math.max(0, numZeros - Math.floor(n).toString().length );
      var zeroString = Math.pow(10,zeros).toString().substr(1);
      if( this < 0 ) {
          zeroString = '-' + zeroString;
      }
  
      return zeroString+n;
  } 
}