[tryfinally]

C# 9, but with some hacks you can bump it up to C# 10 - actually works and surprisingly stable. Can't wait for them to finally migrate to CoreCLR, though.

[moron4hire]

I got out of doing Unity development 7 years ago because I was tired of waiting for them to migrate to CoreCLR (among many other reasons).

[pjmlp]

Unfortunately the way they managed to stick with MonoRuntime and Burst, kind of made more harm than good, regarding C# adoption on the games industry.

Many issues people associate with C#, are actually only relevant in Unity, because of this.