props is not reactive in 2.7.0-beta.2

[sxzz]

Version

2.7.0-beta.2

Reproduction link

stackblitz.com

Steps to reproduce

import { defineComponent, isReactive, toRefs } from 'vue';

export default defineComponent({
  props: {
    foo: String,
  },
  setup(props) {
    console.log(props, isReactive(props));

    // toRefs() expects a reactive object but received a plain one.
    console.log(toRefs(props, 'foo'));
  },
});

What is expected?

props is reactive.

What is actually happening?

props is not reactive.

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P.S. createApp doesn't exist now. Will it be added in the final version of 2.7?