-void mp_resize(mp *m, size_t sz)
-{
-/* mparena *a = (m->f & MP_BURN) ? MPARENA_SECURE : MPARENA_GLOBAL; */
-/* mpw *v; */
-/* size_t len = MP_LEN(m); */
-/* assert(((void)"can't make size less than length", sz >= len)); */
-/* v = mpalloc(a, sz); */
-/* if (!(m->f & MP_UNDEF)) */
-/* memcpy(v, m->v, MPWS(len)); */
-/* if (m->f & MP_BURN) */
-/* memset(m->v, 0, MPWS(m->sz)); */
-/* mpfree(m->a, m->v); */
-/* m->a = a; */
-/* m->v = v; */
-/* m->vl = v + len; */
-}