Testing of gmpy2 mpfr to_binary and from_binary
-----------------------------------------------

    >>> import gmpy2
    >>> from gmpy2 import mpfr,to_binary,from_binary

Test
----

    >>> x=mpfr("0");x==from_binary(to_binary(x))
    True
    >>> x=mpfr("1");x==from_binary(to_binary(x))
    True
    >>> x=mpfr("-1");x==from_binary(to_binary(x))
    True
    >>> x=mpfr("inf");x==from_binary(to_binary(x))
    True
    >>> x=mpfr("-inf");x==from_binary(to_binary(x))
    True
    >>> x=mpfr("nan");gmpy2.is_nan(from_binary(to_binary(x)))
    True
    >>> x=mpfr(1.345);x==from_binary(to_binary(x))
    True
    >>> x=mpfr("1.345e1000");x==from_binary(to_binary(x))
    True
    >>> x=gmpy2.const_pi()
    >>> x.rc
    -1
    >>> y=from_binary(to_binary(x))
    >>> x==y
    True
    >>> y.rc
    -1
    >>> gmpy2.get_context().precision=100
    >>> x=gmpy2.const_pi();x==from_binary(to_binary(x))
    True
    >>> gmpy2.get_context().precision=200
    >>> x=mpfr(gmpy2.const_pi());x==from_binary(to_binary(x))
    True
    >>> gmpy2.get_context().precision=200
    >>> x=gmpy2.const_pi()
    >>> gmpy2.get_context().precision=300
    >>> x=from_binary(to_binary(x))
    >>> x.precision
    200
    >>> gmpy2.set_context(gmpy2.context())