JSON PUT for list item does not work correctly

https://gist.github.com/2da83d35b8c8b11c3822

This worked fine Tue 5:30am when I built. Now we are hosed again.

It's very very hard not to rant when we change nothing, and either REST doesn't work for 2 days, or when it starts to work again, it breaks something else.

We are blocked.