I mean that language support comes in the form of random third party projects like perbone/luascript[0], so stability and completeness are entirely up to the whims and capabilities of the owner.

It's open source, of course, so that's to be expected, but it also means support for any language other than C# and GDScript is kind of a crapshoot.

[0]https://github.com/perbone/luascript