What the hell Run Stages

stages.pp

stage {'1':}  -> Stage['main']

class first {
  notify {'simulated change':}
}

class second {
  exec { '/bin/echo "I should not have run"':
    refreshonly => true,
    logoutput   => true,
    subscribe   => Notify['simulated change']
  }
}

class { 'first':
  stage => 1,
}

class { 'second': }