For convenience JSON.load() should accept either a Function object or an Object for the data type of the third argument of JSON.load() such that we can call JSON.load() with following forms: 1. JSON.load("http://www.apple.com", function() {/* success */}) 2. JSON.load("http://www.apple.com", function() {/* success */}, {withCredentials: true, ...}); 3. JSON.load("http://www.apple.com", function() {/* success */}, function() { /* failure */ }) 4. JSON.load("http://www.apple.com", function() {/* success */}, function() {/* failure */}, {withCredentials: true, ...}) Currently JSON.load() can be called with forms: (1), (3), and (4). As implied above, form (2) makes using JSON.load() more convenient when a failure callback function isn't necessary, but a person wants to pass an option dictionary because a person doesn't need to explicitly pass null or a reference to an empty function for the value of the third argument.
Created attachment 222936 [details] Patch
Committed r163313: <http://trac.webkit.org/changeset/163313>