Observable: Fix property method in combination with setting array properties. Was missing the oldValues.

Author: jzaefferer

tests/unit/observable/observable_core.js

@@ -18,4 +18,13 @@ test( "key, value", function() {
 	equal( object.name, "Pan" );
 });
 
+test( "key, value on array", function() {
+	var object = [ 1, 2, 3, 4, 5 ];
+	$.observable( object ).bind( "change", function(event, ui) {
+		deepEqual( ui.oldValues, { 2: 3 } );
+		deepEqual( ui.newValues, { 2: 88 } );
+	}).property( 2, 88 );
+	equal( object[2], 88 );
+});
+
 }( jQuery ) );

ui/jquery.ui.observable.js

@@ -28,6 +28,9 @@
 			if ( fields.length === 0 ) {
 				return object;
 			}
+			if ( fields.length === undefined ) {
+				return object[ fields ];
+			}
 			while ( fields.length > 1 ) {
 				field = fields.shift();
 				object = object[ field ];