$ perl5.8.8 foo.pl
            Rate ForExcept   BareFor ExceptFor
ForExcept 2511/s        --      -34%      -34%
BareFor   3794/s       51%        --       -1%
ExceptFor 3829/s       52%        1%        --
$ perl5.10.0 foo.pl
            Rate ForExcept   BareFor ExceptFor
ForExcept 2393/s        --      -29%      -30%
BareFor   3350/s       40%        --       -2%
ExceptFor 3429/s       43%        2%        --