Best way to implement "enum" like python, c, java?

[eksperimental]

@kip

  for {note, midi_value} <- @pitches do
    def pitch(unquote(note)), do: unquote(midi_value)
    def pitch(unquote(midi_value)), do: unquote(note)
  end

Elegant solution.
The only one caveat is that since the numbers are not unique you will get a warning saying a previous clause always matches