As long as we're bikeshedding, I've often thought that Lua should warm up to using `my` as a keyword in place of `local`. `let` doesn't convey that it's a scope keyword (LISP heritage notwithstanding), while `local` is long and `loc` is an eyesore.
Of course this can be alleviated with syntax highlighting that would slightly mute the local keyword. And, people using Lua they day probably learn to ignore the keyword automatically.