Revision history for Perl extension Unknown::Values.

0.102   January 21, 2021
        - Fix some package syntax illegal on Perl 5.12

0.101   January 12,2021
        - Fix some POD. No functional change.

0.100   December 29, 2021
        - Breaking change: stringification of unknown values is now fatal
          This is to case fatal errors if you try to use an unknown value as a
          hash key or an array index.
        - Added support for the NULL object pattern (use Unknown::Values ':OBJECT')
        - Fatal unknown values are now loaded via (use Unknown::Values ':FATAL')

0.006   December 13, 2021
        - Test::Difference's eq_or_diff seems to have caused some grief with this module
          (internally trying to dereference my data). is_deeply doesn't cause the
          "Dereferencing cannot be performed on unknown values" error.

0.005   February 25, 2013
        - Fix the minimum Perl assertion in the generated Makefile.PL (Darin McBriade #83563)
        - Add fatal unknown objects (multiple comments this would be useful)
        - unknowns sort last (bart on blogs.perl.org)

0.004   February 20, 2013
        - Fix two invalid overloads (Toby Inkster #83477)
        - is_unknown now defaults to checking $_ (Toby Inkster #83470)
        - Minor doc nits (Toby Inkster and Krasimir Berov #83469 and #83471)

0.003   February 19, 2013
        - Make a non-trial release to claim the namespace on CPAN
        - Update docs to be explicit about EXPORT

0.002   February 19, 2013
        - First release

0.001   February 19, 2013
        - Implement 3VL in Perl ("unknown" instead of "undef")