angular.toJson() strips out keys with "$" as the beginning character

[jloosli]

I can understand why angular strips out keys with "$" as the first character when displaying an object so that it can pull out things like $q, when a result is displayed. However, it's recently caused an issue for me when trying to connect to the rest api of Mongolab when trying to send something like

{$push: {tags: {'red'}}}

as the request object. When actually getting sent, the request object comes across as {}. Keys like $set and $push are actually necessary when working with MongoDB. This happens in the toJsonReplacer function which is called within $http. I can get past this by calling JSON.stringify() myself on the object before sending the request, but I'm wondering if it would be best to disable the stripping of the ${key} values for $http requests.

[caitp]

Dupe of #1463 --- If I recall correctly (and I don't, necessarily), I think this was decided to be tackled in 1.3, but I don't have the full notes from that meeting