Very cool that the language allows specification of a type in this way.
I added a similar type — “non-empty-string” to a typechecker for PHP, and it’s been adopted widely in the PHP ecosystem. It turns out to be pretty handy, especially when there’s a full type system to support it.
> Very cool that the language allows specification of a type in this way.
Check out Idris 2. Dependent types can get very hairy to work with, but that language is an absolute playground for inductive type-level verification. And the standard library is like a nice Haskell standard library to me in a lot of ways, although the language itself is (unsurprisingly) not nearly as "production ready" as Haskell.