111.25.00

- Fix compatibility with OCaml 4.02
update CHANGES.md
112.01.00

- Replaced occurrences of `Obj.magic 0` with `Obj.magic None`.

  With the former the compiler might think the destination type is
  always an integer and instruct the GC to ignore references to such
  values.  The latter doesn't have this problem as options are not
  always integers.