Revert "Fix change detection with binary fields."

This reverts commit 8d79023.

packages/base/src/widget.ts

@@ -500,23 +500,9 @@ class WidgetModel extends Backbone.Model {
             deserialized = {};
             for (let k in state) {
                 if (serializers[k] && serializers[k].deserialize) {
-                    // deserializers should not return an ArrayBuffer or
-                    // DataView, but can return another Typed Array. Otherwise
-                    // Backbone does not register the change because of
-                    // https://github.com/jashkenas/underscore/issues/2692
-                    deserialized[k] = (serializers[k].deserialize)(state[k], manager);
+                     deserialized[k] = (serializers[k].deserialize)(state[k], manager);
                 } else {
-                    // Work around
-                    // https://github.com/jashkenas/underscore/issues/2692,
-                    // which prevents Backbone from seeing that the state
-                    // changed when comparing two dataviews or arraybuffers.
-                    if (state[k] instanceof DataView) {
-                        deserialized[k] = new Uint8Array(state[k].buffer);
-                    } else if (state[k] instanceof ArrayBuffer) {
-                        deserialized[k] = new Uint8Array(state[k])
-                    } else {
-                        deserialized[k] = state[k];
-                    }
+                     deserialized[k] = state[k];
                 }
             }
         } else {