text: module.exports = Math.imul || function(a, b) {
      var ah  = (a >>> 16) & 0xffff;
      var al = a & 0xffff;
      var bh  = (b >>> 16) & 0xffff;
      var bl = b & 0xffff;
      // the shift by 0 fixes the sign on the high part
      // the final |0 converts the unsigned value into a signed value
      return ((al * bl) + (((ah * bl + al * bh) << 16) >>> 0)|0);
  };
  