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my %my_global_values = (foo=>0, etc=>0);
my $rGlobals = \%my_global_values;
sub zigafoo { $rGlobals-> = 7 }

package barbaz;
my %my_package_values = (foo=>0);
my $rPackage = \%my_package_values;
sub foobar { $rPackage->{foo} = 7; }