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Would there be any benefit to compiling dynamic languages with GCs (like Python or Ruby) to WASM? It is cool that is technically possible, but this looks like a target for C, C++, and Rust code.

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C Python and Ruby should "just work" because you can compile their GC into you wasm module.

More general-purpose GC will be supported, but not in the initial release: https://github.com/WebAssembly/design/blob/master/GC.md

It is more attractive to look at WASM as a way to bring a lot of other languages into the web. We are already transpiling a lot of code, ES7, TypeScript, ClojureScript, Dart, and so on. I would say WASM makes a lot better target than JS will ever be.

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