Revision history for Perl extension Unknown::Values.

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")
