[jonlong]

Well, "dependently typed" is widely used to mean something like "derived from Martin-Löf type theory, including arbitrary dependent sums and dependent products"; in other words, "dependent types" means "full fat dependent types", and it's the things that are less powerful that require qualifiers.

(So when Sail says it has "lightweight dependent types", that seems fine to me (it does seem to do more than it could with simple types or polymorphic types), but if it simply asserted that it "had dependent types" I would feel misled.)

The wording is subtle and language does change, but what I want to push back on is the confusion I see from time to time that "if I can write anything that looks like a function from values to types, I have the same thing that everybody talking about dependent types has". If you think this you don't know what you're missing, or even that there is something you're missing, and what you're missing is very cool!