Good to know. What version comes with FreeBSD if you don't install a
port of Perl? Is there some way to just "yank" the installed port and
revert to the default installed version?
Umm.... there isn't perl bundled with the system now. That was removed
many years ago. You're expected to install perl from ports if you want
it on your system.
The default version that the ports would install as a dependency
(assuming you had done nothing to select a different one) or that you
would get by installing from packages is perl-5.12.4 at the moment.
To upgrade to a different version, you need to do something like this:
You have to rebuild / reinstall all perl modules and everything that
embeds perl or that uses perl at run-time when going up such a jump in
versions -- the simple moving things around trick using
perl-after-upgrade is not sufficient here.