I don't think it's unreasonable to expect people to be using at least Perl 5.10.
OK, so there are a bunch of legacy Perl 5.8 and even 5.6 installations out there, but these people shouldn't be expecting to be able to download brand new releases from CPAN.
My own policy is to generally target 5.10, but if I can support 5.8 or earlier without too much extra trouble, then do so (especially on Tiny-style modules). A handful of my distributions even require Perl 5.12 or 5.14.
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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