The enum label length is in terms of bytes, not charactes.

Author: Ian Lawrence Barwick <barwick@gmail.com>
Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAB8KJ=itZEJ7C9BacTHSYgeUysH4xx8wDiOnyppnSLyn6-g+Bw@mail.gmail.com