Create a size-1 tuple for the function arguments in minmax.
Create a size-1 tuple for the function arguments in minmax.

Luckily the empty tuple is a singleton with a reference count of more
than 1, so the PYIU_RECYCLE_ARG_TUPLE macro created a size-1-tuple
before the element was actually set. Otherwise this would try to
access the first element of a size-0-tuple without check...

MSeifert04/iteration_utilities,MSeifert04/iteration_utilities,MSeifert04/iteration_utilities,MSeifert04/iteration_utilities