Unable to pass payload containing ?? via ajax call

[jabley]

jQuery 1.5.2

Firefox 4.0.1, Mac OSX Snow Leopard Firefox 3.6, Windows XP

Attempting to pass a JSON payload via AJAX which contains the string ?? gets treated as a JSONP request and the ajax error function is called, stating that

"jQuery152011057530349834899_1305758039649 was not called"

See ​http://jsfiddle.net/FtX2g/

and

​https://gist.github.com/979756

On IRC, I was advised to use the Javascript escape function on the client, and decode server-side. This feels clunky and also has problems with codepoints unsuitable for transmission in a Latin-1 encoding.

If you change the linked jsfiddle test to use jQuery 1.6, the test passes.

Any plans for further 1.5.x releases, or should I begin to upgrade to 1.6.x?

[Rick Waldron]

Duplicate of #8417.

[jabley]

Actually, if I remove the dataType: "json" option, it works fine.

​http://jsfiddle.net/3J5sv/