> WebAssembly is a true write-once-run-anywhere experience. (Anywhere that can spin up a V8 engine, which is a lot of places these days.) This is true if your

> WebAssembly is a true write-once-run-anywhere experience. (Anywhere that can spin up a V8 engine, which is a lot of places these days.) This is true if your wasm code is purely computational, but if it interacts with the outside world it’s a different story. Each V8 runtime has a subtly different interface, so code that runs on cloudflare V8 might not run in Bun or Deno. Not to mention if you want to support WASI too, which is a different set of bindings even though it’s still WebAssembly. Love or hate Docker, part of its success was that POSIX was already a fairly established standard and there weren’t a lot of vendors driving it in different directions.