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> Say, I want to write code that does '#' on value x. I can write:
>    while #x do break end
>    do local _ = #x end
>    (function () return #x end)()
> Is there something that has least runtime and size overhead,
> i.e. doesn't create extra branches or stack allocations in bytecode?

There's also
	repeat until #x
assuming (as you are) that #x does not return false...
But this generates the simplest bytecode:
	do local _ = #x end