Don't change subroutine results based on list or scalar context.

If I were trying to follow that advice, what should I do if a subroutine that returns a list in a list context gets called instead in a scalar or void context? "die"?

Coercing a strictly list returning function into returning a scalar would be wrong and could be treated as an error of the caller if detected.

But you caught me there, the subroutine would still need to be context-aware to detect that situation. The impact on the subroutine code could be kept at bay, though, if we tucked that piece of logic away, say, in a listonly convenience function. Is something like that already on CPAN? Hmmmm...