[562] appear property on transition object not working

i just noticed the appear property on the transition object doesn't seem to work. and is missing in the docs.

is it not implemented or only missing in the docs and i'm doing something wrong and that makes it not work.

export default {
  transition: {
      appear: true,
      css: false,
      mode: 'out-in',
      enter (el, done) {
       done()
      }
  }
}