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DiveVal(\%hash, map \$_, @elts) = $val;

$hash{ $elts[0] }{ $elts[1] }...{ $elts[n-1] } = $val;

foo.bar=val
foo.bar.baz=val

$hash{$new_key} = delete $hash{$old_key};

$hash{$new_key} = delete $hash{$old_key}
   if exists $hash{$old_key};