added value to RxInterface

@@ -13,12 +13,6 @@ class _RxImpl<T> implements RxInterface<T> {
       HashMap<Stream<T>, StreamSubscription>();
 
   T _value;
-  T get value {
-    if (getObs != null) {
-      getObs.addListener(subject.stream);
-    }
-    return _value;
-  }
 
   /// Common to all Types [T], this operator overloading is using for
   /// assignment, same as rx.value
@@ -143,6 +137,13 @@ class _RxImpl<T> implements RxInterface<T> {
     subject.add(_value);
   }
 
+  T get value {
+    if (getObs != null) {
+      getObs.addListener(subject.stream);
+    }
+    return _value;
+  }
+
   Stream<T> get stream => subject.stream;
 
   StreamSubscription<T> listen(void Function(T) onData,

@@ -17,6 +17,10 @@ abstract class RxInterface<T> {
 
   bool get canUpdate;
 
+  set value(T val);
+
+  T get value;
+
   /// Closes the stream
   void close() => subject?.close();
 
@@ -75,7 +79,7 @@ abstract class DisposableInterface {
   /// Or dispose objects that can potentially create some memory leaks,
   /// like TextEditingControllers, AnimationControllers.
   /// Might be useful as well to persist some data on disk.
-  void onClose() async {}
+  Future<void> onClose() async {}
 }
 
 /// Used like [SingleTickerProviderMixin] but only with Get Controllers.

@@ -48,7 +48,7 @@ class GetxController extends DisposableInterface {
   void onReady() async {}
 
   @override
-  void onClose() async {}
+  Future<void> onClose() async {}
 }
 
 class GetBuilder<T extends GetxController> extends StatefulWidget {