s would be merely for
     convenience, but still might be useful.  Rounding would be the same as
     for an <code>mpf_t</code> (ie. currently round-to-nearest, but not
     actually documented).  Alternately, perhaps a separate
     <code>mpq_get_str_point</code> or some such might be more use.  Suggested
     by Pedro Gimeno.
<li> <code>mpz_rscan0</code> or <code>mpz_revscan0</code> or some such
     searching towards the low end of an integer might match
     <code>mpz_scan0</code> nicely.  Likewise for