RadioButtonGroupInput do not call its onChange prop

[Kmaschta]

What you were expecting:
When using a component, and its value change, I expect its prop onChange function called

What happened instead:
The onChange function passed to a RadioButtonGroupInput isn't called

Steps to reproduce:

1. Go the the following sandbox https://codesandbox.io/s/winter-sun-oq5tt
2. Edit any post
3. Select any Notifications recipients, there is no warning triggered by the onChange prop

Related code:

<RadioButtonGroupInput
    source="notifications"
    choices={[
        { id: '12', name: "Ray Hakt" },
        { id: '31', name: "Ann Gullar" },
        { id: '42', name: "Sean Phonee" }
    ]}
    onChange={values => console.warn('TRIGGERED', values)} // never caled
/>

Environment

• React-admin version: latest
• Last version that did not exhibit the issue (if applicable):
• React version:
• Browser:
• Stack trace (in case of a JS error):