docs: function initWithActions (actionType, actions) {
      var prev = actions[0].copy()
        , now
        , i
      for (i=1; i<actions.length; i++) {
          now = actions[i].copy()
          if (now) {
              prev = new actionType({one: prev, two: now})
          } else {
              break
          }
      }
  
      return prev
  }