.
<li> <code>mpz_and_ui</code> etc might be of use sometimes.  Suggested by
     Niels Möller.
<li> <code>mpf_set_str</code> and <code>mpf_inp_str</code> could usefully
     accept 0x, 0b etc when base==0.  Perhaps the exponent could default to
     decimal in this case, with a further 0x, 0b etc allowed there.
     Eg. 0xFFAA@0x5A.  A leading "0" for octal would match the integers, but
     probably something like "0.123" ought not mean octal.
<li> <code>GMP_LONG_LONG_LIMB</code> or some such could become