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$ perl -wMstrict -MData::Dump -e ' @{$a->{list}} = ();     dd $a'
{ list => [] }
...
{ list => [] }
$ perl -wMstrict -MData::Dump -e ' my @x = @{$a->{list}};  dd $a'
Can't use an undefined value as an ARRAY reference at -e line 1.