title: How to use an "any" type with JSON Schema?
body: <p>I am looking at this:</p>
  
  <p><a href="https://json-schema.org/understanding-json-schema/reference/type.html" rel="noreferrer">https://json-schema.org/understanding-json-schema/reference/type.html</a></p>
  
  <p>I have an object with a function property, but I don't want to set additionalProperties to true. So I want do something like:</p>
  
  <pre><code>      "properties": {
          "getHostNameSync": {
            "type": "any",   // &lt;&lt; any
            "required": false
          }
        }
  </code></pre>
  
  <p>but it says my schema definition is invalid. Is there a way to include functions properties?</p>