Log Message:
Update to 1.42
--------------
1.42 -- 2015/04/23 01:25:55
        [CHANGES]
         * Added List::Util::unpairs() - the inverse of pairs()
         * Documentation to pre-warn users about the possible behaviour in a
           later version where the pair* higher-order functionals are no longer
           transparent to $_

        [BUGFIXES]
         * Silence some warnings at test time
         * Ensure that the List::Util we're loading the XS via is a sufficient
           version when Scalar::Util or Sub::Util load it (RT100863)