push @{ $deep_array_ref->[0][0][0][0] }, 4;
Surely you mean
push @{ ${ ${ ${ ${$deep_array_ref}[0] }[0] }[0] }[0] }, 4;
If you don't mean that... I don't know why postderef upsets you so much. It's just like, you know, the rest of that syntax.
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