> As for the present. Wasm blocks and loops absolutely can take parameters; it's part of the multi-value extension which V8 implemented already a year ago Agre

> As for the present. Wasm blocks and loops absolutely can take parameters; it's part of the multi-value extension which V8 implemented already a year ago Agree with all you wrote. With my own implementation, I'm hesitant to include these extensions until they are "standardized" (I have a one-man toy project, bleeding edge is unreasonable). I understand and have watched as going through the phases seems like quite a slow process (not that it's a bad thing). I think, to avoid fragmentation, it is reasonable for someone targeting WASM at this point to assume the multi value extension is not available. I know there are proposals about runtime capabilities and the like, but with so few of these extensions reaching full spec adoption yet, I don't think they're viable features to leverage even if implemented in the most popular runtimes.