Hotfix compilation error and missing generics

Author: akarnokd

src/main/java/io/reactivex/Observable.java

@@ -1050,7 +1050,7 @@ public final Observable<Boolean> any(Predicate<? super T> predicate) {
 
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> asObservable() {
-        return new ObservableWrapper<T>(this);
+        return new ObservableFromSource<T>(this);
     }
 
     @SchedulerSupport(SchedulerSupport.NONE)

src/main/java/io/reactivex/internal/operators/observable/ObservableFromPublisher.java

@@ -36,6 +36,9 @@ static final class PublisherSubscriber<T>
     extends AtomicBoolean
     implements Subscriber<T>, Disposable {
 
+        /** */
+        private static final long serialVersionUID = -7306579371159152354L;
+        
         private final Observer<? super T> o;
         private Subscription inner;
 

src/main/java/io/reactivex/observers/single/SingleSerializedObserver.java

@@ -17,13 +17,13 @@
 import io.reactivex.disposables.Disposable;
 import java.util.concurrent.atomic.AtomicBoolean;
 
-public final class SingleSerializedObserver implements SingleObserver {
+public final class SingleSerializedObserver<T> implements SingleObserver<T> {
 
-    final SingleObserver actual;
+    final SingleObserver<? super T> actual;
 
     final AtomicBoolean once = new AtomicBoolean();
 
-    public SingleSerializedObserver(SingleObserver actual) {
+    public SingleSerializedObserver(SingleObserver<? super T> actual) {
         this.actual = actual;
     }
 
@@ -33,7 +33,7 @@ public void onSubscribe(Disposable d) {
     }
 
     @Override
-    public void onSuccess(Object value) {
+    public void onSuccess(T value) {
         if (once.compareAndSet(false, true)) {
             actual.onSuccess(value);
         }