EctoApi.Builder.cast_many

You're seeing just the callback cast_many, go back to EctoApi.Builder module for more information.
Link to this callback

cast_many(arg1, any, arg3)

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Specs

cast_many(Ecto.Queryable.t(), any(), Keyword.t()) ::
  {:ok, [Ecto.Schema.t()]} | {:error, any()}