objectify() in lib/Math/BigInt.pm now uses 'isa' not 'eq' to check object
relationship. This is necessary for correct handling of subclasses.objectify() in lib/Math/BigInt.pm no longer expects as_int(), as_number()
and as_float() to return objects, but allows them to return numbers
formatted as strings. This is used by some other modules on CPAN.Better documentation of as_int() and as_number() in lib/Math/BigInt.pm.
Add documentation for as_float() in lib/Math/BigFloat.pm
Add test files t/objectify_mbf.t and t/objectify_mbi.t.