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c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my %hash;
...
 dd \%hash;
"
{ www => { xxx => { yyy => {} } } }

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"no autovivification;
...
 dd \%hash;
"
{}

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my %h;
...
  "access in aliased (lvalue) context",
  { www => { xxx => { yyy => { zzz => undef } } } },
)