`with` clause in `ownership_checkout/2` always mismatch

[melpon]

In db_connection 2.0.0:

  def ownership_checkout(manager, opts) do
    with {:ok, pid} <- Manager.checkout(manager, opts) do
      case Holder.checkout(pid, opts) do

And Manager.checkout/2 spec:

  @spec checkout(GenServer.server, Keyword.t) ::
    :ok | {:already, :owner | :allowed}

As a result, Ecto.Adapters.SQL.Sandbox.checkout/2 returns :ok, but Holder.checkout/2 has not called.

[josevalim]

Good catch, thank you!