Weak polymorphism is not unified nor propagated when used in a function
Some examples here:
# let r = ref ([ 'a* ]) [];;
val r : { get=[ ] -> [ '_weak0* ] set=[ '_weak0* ] -> [ ] } = { get=<fun>
# let f (x : Int) : Int = r := [ x ]; x + 1;;
val f : Int -> Int = <fun>
# r;;
- : { get=[ ] -> [ '_weak0* ] set=[ '_weak0* ] -> [ ] } = { get=<fun>
set=<fun> }
# let g (x : 'a) : 'a = r := [ x ]; x;;
val g : 'a -> 'a = <fun>
# g 3;;
- : 3 = 3
# g;;
- : 'a -> 'a = <fun>
# r;;
- : { get=[ ] -> [ '_weak0* ] set=[ '_weak0* ] -> [ ] } = { get=<fun>
set=<fun> }