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On Wed, Aug 19, 2015 at 12:05 PM, Stephan Hennig <sh-list@posteo.net> wrote:
> Extending tostring() to automatically act like
> format() when multiple arguments are given won't work in the case of
>
>   tostring('%s', nil)
>
> unfortunately.

Why not?  Functions can know how many arguments they are passed, even
if the last argument is nil.

-Parke