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Maybe a dumb question, but what is the C# compiler and runtime that you use?

I used to be up to date with .NET and Mono and stuff but I'm 10 years out of date

Modern .NET/C# is cross-platform by default (CoreCLR runtime). You don't need Mono anymore.

I am not at all familiar with C# development, but the author mentions Native-AOT, which, from a cursory look, seems like a C# compiler.