Both exists and defined still can autovivify on deep hashes though.

No, it's the dereference operator that does the autovivification. Any autovivification occurs before defined and exists are called. 

$ perl -MData::Dumper -e'$h{notexist}{baz}; print Dumper \%h'
$VAR1 = {
          'notexist' => {}
        };

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In reply to Re^6: eval, Read environment variable and expand using eval by ikegami
in thread eval, Read environment variable and expand using eval by tart

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