Merge branch 'master' into master

reactfire/firestore/index.tsx

@@ -48,8 +48,8 @@ export function useFirestoreDoc<T = unknown>(
 ): T extends {} ? T : firestore.DocumentSnapshot {
   return useObservable(
     doc(ref),
-    'firestore doc: ' + ref.path,
-    checkStartWithValue(options)
+    `firestore:doc:${ref.firestore.app.name}:${ref.path}`,
+    options ? options.startWithValue : undefined
   );
 }