This would be great! But also, we'd have to find a way to still have it work on Julia 1.0, i.e. the package here needs to support both JSON 0.21.4 and the newer versions...

Different questions: do you know if JSON.jl in its current form is amendable to static compilation? That would be a major benefit...

This will also pull in a bunch more dependencies, which is a bit annoying (but something we can handle). It shouldn't be that hard to support both the 0.20 API and this though, I'll play around with that a bit more.

There's also https://github.com/JuliaIO/JSON.jl/tree/master/vendor, but the LS is at least somewhat performance sensitive, so maybe it's not the best idea to use that.

Different questions: do you know if JSON.jl in its current form is amendable to static compilation? That would be a major benefit...

Reasonably sure it isn't, although JSONX should be.