> I think it's a better evidence exactly because it's what language users are asking about, and what large chunk of language users choose to use when they got a choice. This shows that quite a big share if not majority of programmers value type annotations.
To be clear, this is where I disagree. I don’t want to claim that people don’t think hard about language design or that users aren’t asking for these features as I think both of those statements are true. But I strongly disagree that languages doing things (and those languages being popular) is good evidence that those things are good.
I think a lot of language design is driven by fashion (ie keeping up with what similar languages are doing) and I claim that this is a more convincing reason for python having some gradual typing.
I think large number of people is moving to/from from python for gradual typing in aggregate, and I don’t think it’s happening on the margin either. I think any wise decisions about languages are more likely to be driven by practical considerations (what do people know, what are they used to, what can people be hired for, what libraries are available, what platforms are supported, what performance is required, and so on).
Just because python has a large market share, it doesn’t mean it’s users are supporters of gradual typing, it just means that they thought python was a good idea when they first started using it and they haven’t justified the cost of changing to something else. The users didn’t choose gradual typing they just chose “upgrade the language to the next version”
Even if I agreed with your claim that many users asked for gradual typing, I don’t agree that in aggregate users ask for things that will be good for them or good in general. Maybe users are just trying to figure out a way to say “we want our programs to be less buggy” and think this might help. I think there are better examples in programming language design of what can happen if you keep giving users what they are asking for.
