$piece is a reference. You push the same reference onto your arrayref 3 times. It does not matter when or how you change some sub-part of the thing the reference points to. If you want 3 different elements in your arrayref then you are going to have to deep-copy $piece at every push.

🦛

In reply to Re: Unwanted cloning of array elements by hippo
in thread Unwanted cloning of array elements by oakbox

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