docs: function setOptions(bench, options) {
      options = extend({}, bench.constructor.options, options);
      bench.options = forOwn(options, function(value, key) {
        if (value != null) {
          // add event listeners
          if (/^on[A-Z]/.test(key)) {
            forEach(key.split(' '), function(key) {
              bench.on(key.slice(2).toLowerCase(), value);
            });
          } else if (!hasKey(bench, key)) {
            bench[key] = deepClone(value);
          }
        }
      });
    }