Miscellaneous Functions
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 - Function: void mpf_random2 (mpf_t ROP, mp_size_t MAX_SIZE, mp_exp_t
          MAX_EXP)
     Generate a random float of at most MAX_SIZE limbs, with long
     strings of zeros and ones in the binary representation.  The
     exponent of the number is in the interval -EXP to EXP.  This
     function is useful for testing functions and algorithms, since
     this kind of random numbers have proven to be more likely to
     trigger corner-case bugs.  Negative random numbers are generated
     when MAX_SIZE is negative.