Polkadot postmortem (kind of caused by Rust nightly change)

Thank you for the resources, although I think it is off-topic. Undefined behaviour is not at issue here.

I thought louder warnings would be useful too, so I added them

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There seems to be a misunderstanding about what undefined behaviour is and why it's qualitatively different from a library function changing its behaviour between versions, so I thought it was important to make sure everyone's on the same page.

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