Hot take frinklang.org is one of the most interesting demonstrations of "real world" dynamic types as something beyond just "not static types". I don't see how its unit affordances would be feasible without runtime type manipulation.
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One example: if you define a new unit "duck", Frink immediately understands what a "kiloduck" is. It knows how the kilo- prefix works with any unit.
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Curious to know why this is dynamic vs. static type thing. It's certainly seems to be either an argument against extensible type systems, or an argument for domain-specific static type systems, or for a blending between the static and dynamic (I like the last one).
I've found this big survey of stuff related to units of measure handy in the past: gmpreussner.com/research/dimen - covers a huge range of stuff from the static to the dynamic. You may have seen it before though.
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That list is really cool because it defines the relevant concepts under standard nomenclature - in this case 'prefix names' and 'prefix symbols', and summarises how each system implements them.
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