0.3.3: 22 Dec 2011: Compiles with both integer-simple and integer-gmp (but mis-behaves with standard integer-gmp).
0.3.2: 28 Feb 2011: Adapted to work with mpfr 3.0.0, now depends on integer-simple.
0.3: 23 Sep 2009: Added mutable interface and removed some modules from the export list.
0.2.2: 2 Sep 2009: Fixed a minor bug in internal handling.
0.2.1: 25 Aug 2009: Fixed a serious bug in fromInteger conversion.
0.2: 5 May 2009: Add support for functions new in mpfr 2.4.1