Using `...` syntax on exposed API.

Hey team, I just had some fun debugging this! I have some code where I essentially do:

function blah (...args) {
   const api = Comlink.wrap(worker);
   return api[name](...args);
}

Where the splat function call transpiles to:

return api[name].apply(api, args);

The .apply triggers the get trap on the Proxy which returns another Proxy, and chaos ensues

I guess you could maybe add another guard to the get trap for this case? For now I'll just target ES2015!