mpfr
exceptions<'memory overflow'>
is possible any time
mpfr
runs out of memory.
<'bad mpfr specification'>
will be returned
if an input argument recognizably violates the required specification.
<'mpfr error'>
message is returned in the event of any
unexpected behavior or irregular status from the API.
<'mpfr overflow'>
can be cause by the
nat2mp
function if a natural number has too many bits to be
represented exactly as an mpfr
number.