WebAssembly and zero-copy buffers

[hazae41]

I'm trying to find a way to pass zero-copy buffers from Rust to JS to WASM.

For now, according to this issue in WebAssembly design, we have to copy buffers from JS to WASM.
We can pass WASM pointers to JS, but they are valid until the WASM memory grows, so we can't rely on this.

Any idea? Could Deno go beyond this design choice? Is this impossible?