Operating with older versions of Perl isn't about disk space, it's about allowing a complex already-configured system to run an application without performing an operation (such as upgrade) that could render the rest of the system useless and unstable.
Why would you need to upgrade?
In reply to Re^4: Building a web-based system administration interface in Perl
by Anonymous Monk
in thread Building a web-based system administration interface in Perl
by wazoox
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