FWIW: there is the Safe module to disallow certain Op-codes inside a (r)eval.
use Safe;
$compartment = new Safe;
$compartment->permit(qw(time sort :browse));
$result = $compartment->reval($unsafe_code);
Unfortunately I couldn't find a way to disable compiletime blocks like BEGIN and there doesn't seem to be another way to disable or override BEGIN...
I'd love to be corrected.
UPDATE
oh Keyword::Simple could do the trick :)
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