It's been awhile since I skimmed the proposal. What I remember is that it was "just enough" to be compatible with Javascript; but didn't have the hooks that C#

It's been awhile since I skimmed the proposal. What I remember is that it was "just enough" to be compatible with Javascript; but didn't have the hooks that C# needs. (I don't remember any mentions about the JVM.) I remember that the C# WASM team wanted callbacks for destructors and type metadata. Personally, having spent > 20 years working in C#, destructors is a smell of a bigger problem; and really only useful for debugging resource leaks. I'd rather turn them off in the WASM apps that I'm working on. Type metadata is another thing that I think could be handled within the C# runtime: Much like IntPtr is used to encapsulate native pointers, and it can be encapsulated in a struct for type safety when working with native code, there can be a struct type used for interacting with non-C# WASM managed objects that doesn't contain type metadata.