Nit: It's not autovivified.

my $href = {};
my $id = $href->{id};
print((%$href ? "not empty" : "empty"), "\n");

__END__
output
======
empty

[download]

Hash entries are never autovified.

In reply to Re^2: Warnings not being thrown with DBI by ikegami
in thread Warnings not being thrown with DBI by hubb0r

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