title: Mark all object properties, including nested objects as required
body: <p>Is there a way to do it by default? And not by hand for every property? </p>
  
  <p>If it's possible, i hope it can be done in Joi.default</p>
  
  <pre><code>const joi = Joi.defaults((schema) =&gt; {
    return schema.strict().options({ stripUnknown: true })
  })
  </code></pre>