JSON3 does not escape dicts of dicts

[rengzhengcodes]

A dictionary that takes dictionaries as keys (very stupid, I know, but it's a quick-and-dirty solution I'm testing), results in improper serialization when writing to file:
"(Dict{String, BigFloat}("lat" => , "lon" => ), Dict{String, BigFloat}("lat" => , "lon" => ))"

Where "lat" and "lon" are originally strings.

[quinnj]

Yeah, we've never really supported non-string-like things for object keys because we short-cut by just calling string(x) on whatever the key is supposed to be. I'll have to think through this a bit more, but we might be able to do something better here.

[rengzhengcodes]

Thanks! Json.write() seems to exhibit closer to the intended behavior, but the read seems to have issues. Given Stringify is extensionally equivalent for base-objects, it would be rather unsafe but plausible to put a parse clause around the keys instantiating them I believe. Probably could work better with type detection then parsing the arguments but that's a digression.

I'll try to figure something out and come back with a solution for those that make their way here from when this ends up being indexed by google.