Log Message:
p5-Math-BigInt: update to 1.999818.

 * Fix CPAN RT #130736 regarding numify() on a Math::BigFloat with a large
   number of digits and an equally large, but negative, exponent.

 * Fix a problem in to_ieee754() due to rounding in bpow().

1.999817 2019-10-11

 * Avoid non-integers in intermediate computations in Math::BigInt::Calc. This
   causes errors due to rounding issues, e.g., 47265625999999999 / 1000000000
   is 47265626 with double precision.

 * Remove api_version() and the corresponding test file. There is no need to
   check which methods are supported by a backend library now that each backend
   library is a subclass of Math::BigInt::Lib. Methods not provided in the
   backend library are provided by the parent class.

 * Add to_ieee745() and from_ieee754().

 * Add backermann() and ackermann() for the Ackermann function.

 * Add buparrow() and uparrow() for Knuth's up-arrow notation.

 * Add information about the github repository.

 * Update links in SUPPORT section in POD.

 * Fix bpow(). It returned NaN when it should truncate to zero.

 * Make blsft() in Math::BigInt allow bases up until the largest unsigned
   integer.

 * Make _lsft() in Math::BigInt::Calc handle an arbitrarily large base.

 * Add new methods bdigitsum() and digitsum() to Math::BigInt. Add new method
   _digitsum() to Math::BigInt::Lib.

 * Add new methods is_non_negative() and is_non_positive().

 * Extend the default collation sequence used by to_base() and from_base() to
   all the 94 printable ASCII characters except blank/space.

 * Make new() in Math::BigFloat handle octal floating point numbers.

 * Slightly more robust t/01load.t.

 * Remove unused variables.

 * Miscellaneous code cleanup.