Fixes #13548. .data should not miss attr() set data-* with hyphenated…

… property names

src/data.js

@@ -264,6 +264,14 @@ jQuery.fn.extend({
 				if ( data !== undefined ) {
 					return data;
 				}
+
+				// Attempt to get data from the cache
+				// with the key camelized
+				data = data_user.get( elem, camelKey );
+				if ( data !== undefined ) {
+					return data;
+				}
+
 				// Attempt to "discover" the data in
 				// HTML5 custom data-* attrs
 				data = dataAttr( elem, key, undefined );

test/unit/data.js

@@ -497,7 +497,7 @@ test("jQuery.data should follow html5 specification regarding camel casing", fun
 	div.remove();
 });
 
-test("jQuery.data should not miss data with preset hyphenated property names", function() {
+test(".data should not miss preset data-* w/ hyphenated property names", function() {
 
 	expect(2);
 
@@ -514,6 +514,17 @@ test("jQuery.data should not miss data with preset hyphenated property names", f
 	});
 });
 
+test(".data should not miss attr() set data-* with hyphenated property names", function() {
+	expect(1);
+
+	var div = jQuery("<div/>").appendTo("#qunit-fixture");
+
+	div.attr( "data-long-param", "test" );
+	div.data( "long-param", { a: 2 });
+
+	deepEqual( div.data("long-param"), { a: 2 }, "data with property long-param was found" );
+});
+
 test("jQuery.data supports interoperable hyphenated/camelCase get/set of properties with arbitrary non-null|NaN|undefined values", function() {
 
 	var div = jQuery("<div/>", { id: "hyphened" }).appendTo("#qunit-fixture"),