[sblom]

Go was definitely ahead of the curve on a few things.

I'd argue C# was there (or very very close). C# has had value types (and fine-grained memory layout) since the beginning, reified generics since .NET 2.0, and also (lesser-known fact) raw pointer support (inside `unsafe {}` blocks much like Rust's approach). This was all motivated by interoperability with native code (mostly Win32 or other C-like ABIs & COM).

In 2009, the concurrency paradigm in .NET was more like promises and not quite as slick as goroutines. async/await wasn't born until 2012.

It wasn't on your list, but I'll toss in another point that works in favor of your original claim. ;) The main C# project also wasn't TRULY multi-platform until 2014.