Currently the simple event plugin defines a priority for the event but not all events go through the SimpleEventPlugin. That's just one of several EventPlugins. The remaining ones now get the wrong priority associated with them. 

E.g. I think all of these should be discrete:

change
compositionend
compositionstart
compositionupdate
selectionchange
textinput

These show up too but I don't know if they're even bridged.

dblclick
pointerenter
pointerleave

Flare defines its own priorities.
targetInst = null;
      } else if (tag === HostRoot) {
        const root: FiberRoot = nearestMounted.stateNode;
        if (root.hydrate) {
          
          
          return getContainerFromFiber(nearestMounted);
        }
        targetInst = null;
      } else if (nearestMounted !== targetInst) {
        
        
        
        
        targetInst = null;
      }
    }
  }
  dispatchEventForPluginEventSystem(
    domEventName,
    eventSystemFlags,
    nativeEvent,
    targetInst,
    targetContainer,
  );
  
  return null;
}
export function getEventPriority(domEventName: DOMEventName): * {