<nitpick... but only in the hope that it may be relevant for anyone looking for additional info>
The "latest Perl build" from ActiveState is "ActivePerl 5.8.8.822" -- no decimals in the build number. Noted, because searching the ActiveState site for "8.2.2" returns (variously) an error ("query string contained only ignored characters") or a nothing found message.
</nitpick>

Sorry not to have an answer for your threshold question.