 a documented
     feature of gmp.h, so applications could know whether to
     <code>printf</code> a limb using <code>%lu</code> or <code>%Lu</code>.
<li> <code>GMP_PRIdMP_LIMB</code> and similar defines following C99
     &lt;inttypes.h&gt; might be of use to applications printing limbs.  But
     if <code>GMP_LONG_LONG_LIMB</code> or whatever is added then perhaps this
     can easily enough be left to applications.
<li> <code>gmp_printf</code> could accept <code>%b</code> for binary output.
     It'd be