fix(combineLatest): emit unique array instances with the default projection

Author: Mark Buer

spec/operators/combineLatest-spec.ts

@@ -461,4 +461,14 @@ describe('Observable.prototype.combineLatest', () => {
     expectSubscriptions(e1.subscriptions).toBe(e1subs);
     expectSubscriptions(e2.subscriptions).toBe(e2subs);
   });
+
+  it('should emit unique array instances with the default projection', () => {
+    const e1 =   hot('-a--b--|');
+    const e2 =   hot('--1--2-|');
+    const expected = '-------(c|)';
+
+    const result = e1.combineLatest(e2).distinct().count();
+
+    expectObservable(result).toBe(expected, { c: 3 });
+  });
 });

src/operator/combineLatest.ts

@@ -150,7 +150,7 @@ export class CombineLatestSubscriber<T, R> extends OuterSubscriber<T, R> {
       if (this.project) {
         this._tryProject(values);
       } else {
-        this.destination.next(values);
+        this.destination.next(values.slice());
       }
     }
   }