past releases, so
     need to be careful about changing it.  It used to be a define
     applications had to set for long long limb systems, but that in
     particular is no longer relevant now that it's established automatically.
<li> The various reuse.c tests need to force reallocation by calling
     <code>_mpz_realloc</code> with a small (1 limb) size.
<li> One reuse case is missing from mpX/tests/reuse.c:
     <code>mpz_XXX(a,a,a)</code>.
<li> When printing <code>mpf_t</code> numbers with exponents &