code: function _ioCancel(o, s) {
          if (o && o.c) {
              o.e = s;
              o.c.abort();
          }
      }
docs: @description Terminates a transaction due to an explicit abort or
  timeout.
  
  @method _ioCancel
  @private
  @static
  @param {object} o - Transaction object generated by _create().
  @param {string} s - Identifies timed out or aborted transaction.
  
  @return void