code: function(num) {
          var count; // int
          var nptr; // int
  
          /* Quick check. */
          //if (num == BCG(_zero_)) return TRUE;
  
          /* Initialize */
          count = num.n_len + num.n_scale;
          nptr = 0; //num->n_value;
  
          /* The check */
          while ((count > 0) && (num.n_value[nptr++] === 0)) {
              count--;
          }
  
          if (count !== 0) {
              return false;
          } else {
              return true;
          }
      }
docs: Determine if the number specified is zero or not
  @param bc_num num    number to check
  @return boolean      true when zero, false when not zero.