Example Error when using tsvector with regconfig in Ecto

example.exs

## Migration
def up do
  create table(:books) do
    add :title, :string
    add :summary, :text
    add :language, :text
  end
  
  for lang <- ['english', 'spanish', 'italian'] do
    execute """
    CREATE INDEX books_partial_idx_#{lang} ON books USING GIN(to_tsvector('#{lang}', coalesce(title, '') || ' ' || coalesce(summary, '')))
    WHERE language = '#{lang}';
    """
  end
end

## Example query
def search_partial_indexes(language, search_term) do
  query =
    from(b in Book,
      where: b.language == ^language,
      where:
        fragment(
          "to_tsvector(?, coalesce(title, '') || ' ' || coalesce(summary, '')) @@ to_tsquery(?, ?)",
          ^language,
          ^language,
          ^search_term
        ),
      select: [:title, :summary]
    )

  Repo.explain(:all, query, analyze: true)
end

## Error output
SELECT b0."title", b0."summary" FROM "books" AS b0 WHERE (b0."language" = $1) AND (to_tsvector($2, coalesce(title, '') || ' ' || coalesce(summary, '')) @@ to_tsquery($3, $4)) ["english", "english", "english", "prince"]
↳ :erl_eval.do_apply/7, at: erl_eval.erl:744
** (Postgrex.QueryError) type `regconfig` can not be handled by the types module Postgrex.DefaultTypes
    (ecto_sql 3.8.3) lib/ecto/adapters/sql.ex:932: Ecto.Adapters.SQL.raise_sql_call_error/1
    (ecto_sql 3.8.3) lib/ecto/adapters/sql.ex:847: Ecto.Adapters.SQL.execute/6
    (ecto 3.8.4) lib/ecto/repo/queryable.ex:221: Ecto.Repo.Queryable.execute/4
    (ecto 3.8.4) lib/ecto/repo/queryable.ex:19: Ecto.Repo.Queryable.all/3