title: must not contain children and list, as they're mutually exclusive
body: <p>I need a widget that can configure an array of complex objects, ie E-mail addresses with labels.</p>
  
  <p>if I set the <code>inputFields</code> to have this entry:</p>
  
  <pre><code> {
      key: 'email_addresses', required: false, list: true, children: [{
        key: 'type', required: true, type: 'string'
      }, {
        key: 'email', required: true, type: 'string'
      }]
    }
  </code></pre>
  
  <p>I run into the following error with <code>zapier validate</code>:</p>
  
  <pre><code>Message  │ must not contain children and list, as they're mutually exclusive.    
  </code></pre>
  
  <p>I really would like to be able to have this configuration. Is there any workaround?</p>