Data:Event:Manipulation: Prevent collisions with Object.prototype

Make sure events & data keys matching Object.prototype properties work.
A separate fix for such events on cloned elements was added as well.

Fixes gh-3256
Closes gh-4603

(cherry picked from commit 9d76c0b163675505d1a901e5fe5249a2c55609bc)

1 files changed, 15 insertions, 0 deletions

diff --git a/test/unit/data.js b/test/unit/data.js
index bd0b4e882..138bb8399 100644
--- a/test/unit/data.js
+++ b/test/unit/data.js
@@ -989,3 +989,18 @@ QUnit.test( ".data(prop) does not create expando", function( assert ) {
 		}
 	}
 } );
+
+QUnit.test( "keys matching Object.prototype properties  (gh-3256)", function( assert ) {
+	assert.expect( 2 );
+
+	var div = jQuery( "<div/>" );
+
+	assert.strictEqual( div.data( "hasOwnProperty" ), undefined,
+		"hasOwnProperty not matched (before forced data creation)" );
+
+	// Force the creation of a data object for this element.
+	div.data( { foo: "bar" } );
+
+	assert.strictEqual( div.data( "hasOwnProperty" ), undefined,
+		"hasOwnProperty not matched (after forced data creation)" );
+} );