The video may also give a real answer to this Q as the presenter goes into detail about these things, but I haven't watched it recently. Good to have a look.
I watched the video and it didn't answer that specific question. However if slice creates a view then it still does need to make a new array once any modification is made on the sliced copy. At that point shouldn't it regard it as a new array and be able to optimize it?
It would be awesome though if holey arrays could become non-holey without this kind of VM specific tricking once there are no holes remaining.
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