How to define a string enum field?

[Nicolab]

Hello,

I can't find a way to define an enum with Crecto.

PostgreSQL type:

CREATE TYPE enum_lang AS ENUM('en', 'fr');

The column:

enum_field :enum_lang, Langs, column_name: "lang", column_type: String

Enum:

enum Langs
      EN
      FR
    end

Error:

Unhandled exception: PG::ResultSet#read returned a Slice(UInt8). A (String | Nil) was expected. (Exception)

If i naively replace String by Slice(Uint8), an error occurred because Slice(Uint8) is not a supported type in Crecto.

Please, how am I supposed to handle this enum?