component props are not being injected to fake instance while SSR

[dehypnosis]

It seems that props are not being injected to fake instance properly while SSR.

Here is the component.

{ name: 'ResourceBroker',
... (omitted)
  props: { brokerId: { type: [Function: String], required: true } },
  computed: { broker: [Function: broker] },
  apollo:
   { viewer: { query: [Object], variables: [Function: variables] } },
  render: { [Function: render] _withStripped: true },
  staticRenderFns: [],
  _compiled: true,
  _ssrRegister: [Function: hook],
  beforeCreate: [ [Function: hook] ],
  __file: 'src/pages/resource/broker.vue' }

The component had given attribute broker-id="1" from template.
When vue-apollo/ssr package try to prefetch the query below,

apollo: {
    viewer: {
      query: gql`
        query ($id: ID!) {
          viewer {
...omitted
          }
        }
      `,
      variables () {
        return {
          id: this.brokerId,
        }
      },
    },
  },

The variable id is evaluated as undefined.
Yes, this.brokerId is not being injected to fake instance. but this['broker-id'] has the right value ("1").

So i guess that createFakeInstance function dosen't transform kebab-cased attribute to camelCased attribute. In now, i just changed the name of prop from brokerId to id, then it works.

Wish to someone find out is this a real bug or am i doing something wrong.
Thanks.

[Akryum]

See #469