In master, we have

type fontWeight = [
  | #normal
  | #bold
  | #100
  ...
  | #900
]

Unfortunately, this is not correct. We need a string "100", not an int 100. But this can not be represented as an enum / polymorphic variant (#"100" just gets reformatted to #100, and as far as I can see it is not currently possible to represent the difference in the AST).

We could use an abstract type + an @obj external make with the @string annotation instead, but this usage of @string is likely to get deprecated in ReScript 11, too.

Any other ideas?