Using a dedicated object for value storage

Without this, we are limited in the key names that we can accept from users.  And because of compiler renaming, we don't know ahead of time what the limitations are (e.g. the key 'a' may clobber the 'set' method).

test/spec/ol/object.test.js

@@ -34,6 +34,37 @@ describe('ol.Object', function() {
     });
   });
 
+  describe('#get()', function() {
+
+    it('does not return values that are not explicitly set', function() {
+      var o = new ol.Object();
+      expect(o.get('constructor')).toBeUndefined();
+      expect(o.get('hasOwnProperty')).toBeUndefined();
+      expect(o.get('isPrototypeOf')).toBeUndefined();
+      expect(o.get('propertyIsEnumerable')).toBeUndefined();
+      expect(o.get('toLocaleString')).toBeUndefined();
+      expect(o.get('toString')).toBeUndefined();
+      expect(o.get('valueOf')).toBeUndefined();
+    });
+
+  });
+
+  describe('#set()', function() {
+    it('can be used with arbitrary names', function() {
+      var o = new ol.Object();
+
+      o.set('set', 'sat');
+      expect(o.get('set')).toBe('sat');
+
+      o.set('get', 'got');
+      expect(o.get('get')).toBe('got');
+
+      o.set('toString', 'string');
+      expect(o.get('toString')).toBe('string');
+      expect(typeof o.toString).toBe('function');
+    });
+  });
+
   describe('setValues', function() {
 
     it('sets multiple values at once', function() {
@@ -309,7 +340,7 @@ describe('ol.Object', function() {
   describe('setter', function() {
     beforeEach(function() {
       o.setX = function(x) {
-        this.x = x;
+        this.set('x', x);
       };
       spyOn(o, 'setX').andCallThrough();
     });
@@ -327,8 +358,8 @@ describe('ol.Object', function() {
         var o2 = new ol.Object();
         o2.bindTo('x', o);
         o2.set('x', 1);
-        expect(o.get('x')).toEqual(1);
         expect(o.setX).toHaveBeenCalled();
+        expect(o.get('x')).toEqual(1);
       });
     });
   });