I've added a unit test model for to_json/from_json and taking into account the new Infinity and NaN cases, it seems like we are not here yet, some of those cases do not work

What fails ?

You can check by running the new Serialization.experiment unit test file and see the multiple tests failing.
I can't really understand why some are failing, for example this one:

test infinity_from_literal {
	gama.pref_json_infinity_as_string <- false;
	assert from_json('{"x":Infinity}') = map(['x'::#infinity]);
}

Fails, but if I write this simple model:

model test

experiment ev {
	
	init {
		gama.pref_json_infinity_as_string <- false;
		write from_json('{"x":Infinity}');
		write map(['x'::#infinity]);
		write from_json('{"x":Infinity}') = map(['x'::#infinity]);	
	}
	
}

I have this output:

map(['x'::#infinity])
map(['x'::#infinity])
true

What is even stranger is that if I change pref_json_infinity_as_string to true I have exactly the same result, so maybe one of the problems is that the parameters are not properly handled ?