because of the aliasing, it's also an lvalue

More precisely, because a modifiable alias is required.

because it's too complicated to implement.

I don't think so. We already do that for hash elements, and the same approach could be used to handle more complicated cases. It's a question of performance.

In reply to Re^2: autovivified hash key with foreach $x ( @{$h{a}} ) {}. (Update x2) by ikegami
in thread autovivified hash key with foreach $x ( @{$h{a}} ) {} by Danny

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