AFAIK @$ is not a perl global or package variable
Actually, the punctuation variables are always forced into package main
for hysterical reasons, and are therefore as global (insensitive to current package, and predecalared) as things that use STDIN, STDOUT, STDERR, ARGV, ARGVOUT, ENV, or INC as part of their name.
-- Randal L. Schwartz, Perl hacker
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