Correct non-null|undefined evaluation of data property values. Fixes …

…#9794

src/data.js

@@ -33,7 +33,9 @@ jQuery.extend({
			return;
		}

		var internalKey = jQuery.expando, getByName = typeof name === "string", thisCache,
		var thisCache, ret,
			internalKey = jQuery.expando,
			getByName = typeof name === "string",

			// We have to handle DOM nodes and JS objects differently because IE6-7
			// can't GC object references properly across the DOM-JS boundary
@@ -108,10 +110,24 @@ jQuery.extend({
			return thisCache[ internalKey ] && thisCache[ internalKey ].events;
		}

		return getByName ? 
			// Check for both converted-to-camel and non-converted data property names
			thisCache[ jQuery.camelCase( name ) ] || thisCache[ name ] :
			thisCache;
		// Check for both converted-to-camel and non-converted data property names
		// If a data property was specified
		if ( getByName ) {

			// First try to find the camelCased property
			ret = thisCache[ jQuery.camelCase( name ) ];

			// Test for null|undefined property data was found
			if ( ret == null ) {

				// Try to find as-is property data
				ret = thisCache[ name ];
			}
		} else {
			ret = thisCache;
		}

		return ret;
	},

	removeData: function( elem, name, pvt /* Internal Use Only */ ) {

test/unit/data.js

@@ -525,3 +525,29 @@ test("jQuery.data should not miss data with preset hyphenated property names", f
		equal( div.data(k), k, "data with property '"+k+"' was correctly 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"),
		datas = {
			"non-empty": "a string",
			"empty-string": "",
			"one-value": 1,
			"zero-value": 0,
			"an-array": [],
			"an-object": {},
			"bool-true": true,
			"bool-false": false,
			"some-json": '{ "foo": "bar" }'
		};

	expect( 18 );

	jQuery.each( datas, function( key, val ) {
		div.data( key, val );

		deepEqual( div.data( key ), val, "get: " + key );
		deepEqual( div.data( jQuery.camelCase( key ) ), val, "get: " + jQuery.camelCase( key ) );
	});
});