1..8
ok 1 - no autovivification
ok 2 - no value assigned
ok 3 - f2: no autovivification
ok 4 - f2: no value assigned
ok 5 - f3: no autovivification
ok 6 - f3: no value assigned
ok 7 - f4: autovivification removed
ok 8 - f4: no value assigned