I interpret this discussion towards the idea of not supporting . in @INC in the future for somewhat plausible security reasons.

Note that this would not prevent manually adding dot to @INC.

Update: Also see this bug ticket, which I think was the original report.

In reply to Re^6: Requring minimum perl version in a cpanfile ( use lib '.'; ) by Corion
in thread Requring minimum perl version in a cpanfile by Anonymous Monk

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