My assertion is meant to signify that you should only use sv_2mortal() on SVs returned to the user via the stack, and not on SVs returned to the user embedded within other data structures (hashes & arrays), references to which are returned to the user via the stack.
In that context, I believe the advice is correct.
I never heard or read of this 'substitute for alloca' use to which you allude, but I would be very interested if you could expand a little or point to some documentation regarding that?
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