anchor.diff:        object1.forEachAlive((item) {
   
           if (item.hitTestObject(object2)) {
  -          collisonHandler(item, object2);
  +          collisionHandler(item, object2);
           }
   
         });
  
positive.code:       object2.forEachAlive((item) {
  
          if (item.hitTestObject(object1)) {
            collisonHandler(object1, item);
          }
  
        });
  
negative.code:         object2.forEachAlive((item2) {
  
            if (item1.hitTestObject(item2)) {
              collisionHandler(item1, item2);
            }
  
          });
  