https://bugs.winehq.org/show_bug.cgi?id=16776
--- Comment #10 from Luke Kenneth Casson Leighton lkcl@lkcl.net --- jacek if you have concluded from the mention of the word "JSON" that the problem is fixed, you have made a faulty logical deduction. you should actually be focussing on XMLHttpRequest.
i leave it up to you as to whether you wish to see wine improve by properly following software development practices instead of closing bugreports based on assumptions.