addendum (sorry for the self reference) --
The last three examples take the detour of %i_a_i.sci, which is
inefficient (this was a lapse, _I_ submitted it), so the longer time is
explained; but why the 2nd and the third, which should use a native
SCI/routines/int/i_a_i.f? And wouldn't it be better to implement in
native, rather than percent form, also the other mixed type operations?