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Define a Twilio app in terms of a sane call tree

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package io.github.nafg.dialoguestate

import scala.annotation.unused

case class DTMF private (value: Char) extends AnyVal
object DTMF {
  class ToDTMF[C <: Char] private (val value: C)
  object ToDTMF {
    implicit val zero: ToDTMF['0']  = new ToDTMF('0')
    implicit val one: ToDTMF['1']   = new ToDTMF('1')
    implicit val two: ToDTMF['2']   = new ToDTMF('2')
    implicit val three: ToDTMF['3'] = new ToDTMF('3')
    implicit val four: ToDTMF['4']  = new ToDTMF('4')
    implicit val five: ToDTMF['5']  = new ToDTMF('5')
    implicit val six: ToDTMF['6']   = new ToDTMF('6')
    implicit val seven: ToDTMF['7'] = new ToDTMF('7')
    implicit val eight: ToDTMF['8'] = new ToDTMF('8')
    implicit val nine: ToDTMF['9']  = new ToDTMF('9')
    implicit val star: ToDTMF['*']  = new ToDTMF('*')
    implicit val hash: ToDTMF['#']  = new ToDTMF('#')
  }

  implicit def apply[C <: Char with Singleton](@unused c: C)(implicit toDTMF: ToDTMF[C]): DTMF = new DTMF(toDTMF.value)

  def unapply(dtmf: DTMF): Option[Char] = Some(dtmf.value)

  val all = Seq[DTMF]('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '*', '#')
}