But please do not make passing on PERL5LIB a default.
Why? The PERL5LIB environment variable is set up after the fact (of changing $< and $>) of getting broader permissions via sudo.
So, a well thought-out privilege evelating scheme is more important than the passing of an environment variable while changing $UID, becaue you could set that very ENV var by hand, after running sudo.
That statement of yours which I quoted looks to me very much like the bogus "eval is evil" and "don't use system $string" warnings, which are nonsense as absolutes, i.e. without context.
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