| A | ↛ | ReactionCounterObserver removed | |
| A | ↛ | ReactionTotalObserver removed |
| ⇢ | A | ReactionCounter::setWeightAttribute() added | |
| ⇢ | A | ReactionCounter::setCountAttribute() added | |
| ⇢ | A | ReactionTotal::setWeightAttribute() added | |
| ⇢ | A | ReactionTotal::setCountAttribute() added | |
| A | ↛ | ReactionCounterObserver::creating() removed | |
| A | ↛ | ReactionTotalObserver::creating() removed |