Using crossbeam's channel

[Ciantic]

This is not an issue in the crate, but I found out that the WebAssembly.Memory can be shared between workers. With that method you can use e.g. Crossbeam channel with wasm-bindgen with some caveats. As well as share a HashMap between workers.

I have an example of how to use crossbeam channel between workers in here: https://github.com/Ciantic/rust-shared-wasm-experiments/