perl -E 'use constant AREF => [1..4]; say "@{+AREF}"; AREF->[2] = 99; say "@{+AREF}"'

Good post, this bit in particular reminded me of the recent thread constant vector on exactly that topic.

In reply to Re^2: Using hashref values in constant declarations. by haukex
in thread Using hashref values in constant declarations. by nameofmyuser

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