from "man perlvar"
All Perl variables that begin with digits, control
characters, or punctuation characters are exempt from the
effects of the package declaration and are always forced
to be in package main. A few other names are also exempt:
ENV STDIN
INC STDOUT
ARGV STDERR
ARGVOUT
SIG
so adding
print "\$main::ENV = '$main::ENV'\n";
you get
$main::ENV = '2'
as expected...
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