Could it be related to this?

Unlike dynamic variables created by the local operator, lexical variables declared with my are totally hidden from the outside world, including any called subroutines. This is true if it's the same subroutine called from itself or elsewhere--every call gets its own copy.
(From perlsub).

emc

At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.

—Igor Sikorsky, reported in AOPA Pilot magazine February 2003.

In reply to Re: Doubly-nested deeply bound variable is undefined by swampyankee
in thread Doubly-nested deeply bound variable is undefined by asokoloski

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