[REF] observer: remove revNumber

Closes #257

src/core/observer.ts

@@ -46,10 +46,6 @@ export class Observer {
     const metadata = this.weakMap.get(value);
     return metadata ? metadata.rev : 0;
   }
-  deepRevNumber(value): number {
-    const metadata = this.weakMap.get(value);
-    return metadata ? metadata.deepRev : 0;
-  }
 
   _observe(value, parent) {
     var self = this;
@@ -87,7 +83,6 @@ export class Observer {
       value,
       proxy,
       rev: this.rev,
-      deepRev: this.rev,
       parent
     };
 
@@ -99,11 +94,10 @@ export class Observer {
   _updateRevNumber(target: any) {
     this.rev++;
     let metadata = this.weakMap.get(target);
-    metadata.rev!++;
     let parent = target;
     do {
       metadata = this.weakMap.get(parent);
-      metadata.deepRev++;
+      metadata.rev++;
     } while ((parent = metadata.parent) && parent !== target);
   }
 }

src/store.ts

@@ -85,7 +85,7 @@ export function useStore(selector, options: SelectorOptions = {}): any {
   const component: Component<any, any> = Component.current!;
   const store = options.store || (component.env.store as Store);
   let result = selector(store.state, component.props);
-  const hashFn = store.observer.deepRevNumber.bind(store.observer);
+  const hashFn = store.observer.revNumber.bind(store.observer);
   let revNumber = hashFn(result) || result;
   const isEqual = options.isEqual || isStrictEqual;
   if (!store.updateFunctions[component.__owl__.id]) {