Type inference for refs is weird here

BusinessObjectSearch.vue

<template>
  <div>
    <v-data-table
      :headers="fields"
      :items="objects"
      :sort-by="sortBy"
      class="elevation-1"
    >
    </v-data-table>
  </div>
</template>

<script lang="ts">
import { defineComponent, reactive, toRefs } from '@vue/composition-api';

export default defineComponent({
  setup() {
    const state = reactive({
      fields: [
        { value: 'id', text: 'ID', sortable: false, align: 'start' },
        { value: 'type', text: 'Type' },
        { value: 'name', text: 'Name' },
        { value: 'revision', text: 'Revision' }
      ],
      objects: [],
      sortBy: ['revision', 'name', 'type']
    });
    return toRefs(state);
  }
});
</script>