Real-World Event Sourcing: `handle_command` for subtract doesn't make sense (pg 8)

[dmitrykleymenov]

I’ve found the same issue, but think the code should be like:

  def handle_command(%{value: val}, %{cmd: :sub, value: v}) do
    %{event_type: :value_subtracted, value: min(val - @min_state_value, v)}
  end

In this case we can use @min_state_value correctly(not only 0)