> Wasm blocks and loops absolutely can take parameters; it's part of the multi-value extension which V8 implemented already a year ago.
If that's an extension, and it's only implemented in V8 but not in some of the other main WebAssembly platforms, then I guess it's fair to call it out as not being part of WebAssembly.
It's at phase 3: https://github.com/WebAssembly/proposals
Phase 4 requires a second implementation, and then we will ship it.