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  1. or download this
    $ perl -e '
    use strict;
...
    is_deeply $h, { b => {} }, "f4: autovivification removed";
    is $f4, undef, "f4: no value assigned";
'
  2. or download this
    $ perl -e '
    use strict;
...
    is_deeply $h, { b => {} }, "f4: autovivification removed";
    is $f4, undef, "f4: no value assigned";
'
  3. or download this
    1..8
ok 1 - no autovivification
...
ok 6 - f3: no value assigned
ok 7 - f4: autovivification removed
ok 8 - f4: no value assigned