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Re:An Introduction to Type Level Programming in Haskell by jkhdigital on Thursday September 09, 2021 @09:26PM (#28476757)
The formal notion of subtype seems to be getting some solid research attention; see e.g. https://drops.dagstuhl.de/opus/volltexte/2021/13888/pdf/LIPI...

Hopefully we see these ideas make their way into functional languages soon.

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