this post was submitted on 26 Jun 2024
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Found this on Mastodon https://fosstodon.org/@dpom/112681955888465502 , and it is a very nice overview of the containers and their layout.

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[–] sgued@programming.dev 4 points 4 months ago

Because when T is !Sized, the layout is different, it looks more like the layout of &[T].