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in reply to Re: Autovivification sucking the life out of me
in thread Autovivification sucking the life out of me

I think you missed the point of the post, which is "how is the variable $ENV{TMPDIR} being autovivified?" I am not caring that the value passed into the subroutine is undefined, since the environment variable is indeed not defined. But I do care that the variable outside the subroutine changes from '<absent>' to '<undef>'.