equal object support

is.js

@@ -265,6 +265,29 @@
         if (is.all.boolean(value, other)) {
             return value === other;
         }
+        // check object
+        if (is.all.object(value, other)) {
+            var keys = Object.keys(value),
+                length = keys.length,
+                key;
+
+            if (is.empty(value) && is.empty(other)) {
+                return true;
+            }
+
+            if (length !== Object.keys(other).length) {
+                return false;
+            }
+
+            while(length--) {
+                key = keys[length];
+                if (is.not.propertyDefined(other, key)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
         return false;
     };
     // equal method does not support 'all' and 'any' interfaces

test/test.js

@@ -286,6 +286,30 @@
             it('should return false if given two boolean are not same', function() {
                 expect(is.equal(false, true)).to.be.false;
             });
+            it('should return true if given two object are empty', function() {
+                expect(is.equal({},{})).to.be.true;
+            });
+            it('should return false if given two object are not same number of property', function() {
+                var obj1 = {
+                    test: 'test',
+                    is: 'is'
+                };
+                var obj2 = {
+                    is: 'is'
+                };
+                expect(is.equal(obj1, obj2)).to.be.false;
+            });
+            it('should return true if given two object are the same number of the same properties', function() {
+                var obj3 = {
+                    test: 'test',
+                    is: 'is'
+                };
+                var obj4 = {
+                    test: true,
+                    is: 4
+                };
+                expect(is.equal(obj3, obj4)).to.be.true;
+            });
         });
         checkApi('equal', ['not']);