Sorry, but I think you're using the wrong Perls then. Between every major version of Perl (the 5.5.x train, the 5.6.x train, the 5.8.x train ("stable") and the 5.9.x / 5.10.x train ("blead")), new features get introduced, 5.8 introduced PerlIO and Unicode in a wide range, 5.10 will have new stuff I don't know. If you need to use certain features and rely on certain features that are not commonly used, don't move your program to a new major Perl version before thouroughly testing it.

Of course, if you don't supply the version of Perl your script is used with, you will need to test your script against all versions of Perl, but at least the future versions of Perl go through prereleases ("Release Candidates") before becoming public, and so you have some chance of getting an early warning by testing your program against bleadperl.

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