Give JSON stronger support

[colorworlds]

At present, gdscript's support for JSON seems incomplete.

For example, the built-in type of a Vector2 cannot be converted to an Array or Dictionary, and conversely, an Array or Dictionary can not be parsed into a vector through built-in methods.

And if it is possible, I hope godot can support JSON conversion of custom Object types.

Like object2dic and dict2object in Python.

[Xrayez]

See my closed pull request (I can reopen it if needed):

• Make JSON write and parse incompatible values as Variant consistently godot#33241

But I think that Godot core developers are not really that interested in enhancing JSON support (or serialization/deserialization for that matter).

Perhaps JSON5 could be incorporated in https://github.com/goostengine/goost, at least.

Like object2dic and dict2object in Python.

Are you aware of dict2inst() and inst2dict() functions in GDScript?

Those could also be improved, though:

• Make inst2dict and dict2inst work recursively godot#33137

[colorworlds]

Thank you very much for your previous work.
I haven't noticed dict2inst() and inst2dict() before. Thanks for reminding. These function is very useful to me.

[Calinou]

Consider using ConfigFile instead of JSON to save user configuration and other data that does not need to interoperate with other (non-Godot) software. ConfigFile can serialize any Godot datatype automatically, without requiring you to write custom code for it. ConfigFile also happens to be more human-readable (and even writable) overall.

Supporting the serialization of Godot datatypes in JSON wouldn't be very useful for the goal of interoperability I mentioned, since other software won't automatically know how to interpret those datatypes.