Yes, you can get these on CPAN for 5.8.8, but for @jobs that insist on only using core modules
I have encountered @jobs with just that restriction. Any libre/open software that is not explicitly indemnified by the vendor must be individually approved (along with any dependencies) for the specific version and license.
Perl itself may be an approved product, but non-core modules must go through the same process as any other non-vendor provided resource. Perl 5.10 will not change that aspect of those @jobs, but getting the 5.10 release of Perl approved will be easier than the multitude of individual module updates.