Whatsoever this is not a bug. It's just Limitation of mIRC getting strings up to 4098 Characters. by doing that you may destroy the json array, and make it impossible for the parser to read. Furthermore you won't have the desired results in any case.

i know that the mirc has an limitation but some $json data results have more than 4098 characters so the JSON return an error on because is trying to set the %res with more than 4098 so the only way is to read only 4098 characters instead to return an error, and of course the desired results will not be the correct but its not an code fault but mirc's one.

He can handle errors with :error tag and $error Identifier.

As ^WeSt mentioned, it's not the fault of the code, but mIRC itself gives an error when the data is longer than 4098 characters. I don't think this will destroy the json array, this will only limit the returning string to 4098 characters (correct me if I'm wrong)

The $left may be a temptorary fix until the dev fixes it. I have posted this problem before http://hawkee.com/thread/118182

This is now fixed. For results longer than mIRC's text-length limit, the result is trimmed to 4000 bytes and $json().error is filled