title: Formik, Yup - How to check is Decimal number
body: <p>I have a schema:</p>
  
  <pre><code>const SignupSchema = Yup.object().shape({
    decimal: Yup.number().integer('invalid decimal'),
  });
  </code></pre>
  
  <p>I need to check is number is decimal, but I found only <code>Integer</code> in docs</p>