"functionality" in this case means APIs. WASM won't have any APIs that JS doesn't already have. So "conservative" means "just a few APIs", not "just communicati

"functionality" in this case means APIs. WASM won't have any APIs that JS doesn't already have. So "conservative" means "just a few APIs", not "just communication with code in an already battle-proven VM". And AFAIK there are no plans for "loading and authenticating signed code" in WASM. It's always untrusted unless you run it with a runtime that provides the privileged APIs (such as node.js). Java always had both unprivileged and privileged APIs in the same place.