In the chat we just discussed that 5.18 has been released in 2014 and is long past its support timeframe. In order to prune the ever-growing number of combinations to test on, we're eliminating Perl 5.14 and 5.16 from the test framework and from the list of supported versions, making 5.18 the lowest supported Perl version for 1.7 whenever it gets released. (Note: we can always decide to choose a higher minimum number, if it takes too long to finish 1.7.)