> > $::Foo::a
> 
> This is a shortcut for $main::Foo::a

% perl -e 'package Foo; $a = 2;  print $::Foo::a'
2%
% perl -e 'package Foo; $a = 2;  print $Foo::a' 2%    
2

so every package is a "subpackage" of main?

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