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  1. or download this
    @Foo::ISA = qw(Hello World);

...
my $isa   = *{ $main::{"$class\::"}{ISA} }{ARRAY};

say "@$isa"; # Hello World
  2. or download this
    @Foo::ISA = qw(Hello World);

...
my $isa   = *{qualify_to_ref 'ISA', $class}{ARRAY};

say "@$isa"; # Hello World