fallback locale not working

[oswaldofreitas]

main.js

const i18n = new VueI18n({
  locale: 'es',
  fallbackLocale: 'pt',
  messages: {
    es: { }
    pt: { }
  }
})

new Vue({
  el: '#app',
  router,
  i18n,
  template: '<App/>',
  components: { App }
})

component.vue

<template lang='pug'>
  div
    | {{$t('choose')}}
</template>

<i18n>
pt:
  choose: 'Selecione seu idioma'
</i18n>

I guess this warning messages should not appear and 'choose' should be taken from local component locale messages using the fallback locale 'pt', so in this case should be "Selecione seu idioma".