Table based enums not filterable

[wtravO]

Replication steps:

create table some_random_enum (
  type text primary key,
  description text
);

insert into some_random_enum (type, description) values ('type_one', 'Type One');

create table potato (
  id serial primary key,
  name text,
  type text references some_random_enum
);

insert into potato (name, type) values ('Potato One', 'type_one');

query {
  potato(
    filter: {
      type: {
        equalTo: TYPE_ONE
      }
    }
  ){
    nodes {
      id
      name
      type
    }
  }
}

Error:

Planning error: expected 'pgFilterAttribute' to be present on the $where plan's extensions; your extensions to `postgraphile-plugin-connection-filter` does not implement the required interfaces.