title: React Formik compare values and initual values
body: <p>I have searched and dont know where to look. How do you compare the initual values and your values in formik and when there is a difrence get the name of that value where the difrence is.</p>
  <p>Tried this link but no luck <a href="https://github.com/formium/formik/issues/215" rel="nofollow noreferrer">https://github.com/formium/formik/issues/215</a></p>
  <p>if there is a new value for username when you update it , I want to know username updated .</p>
  <pre><code>&lt;Formik
              innerRef={formRef}
              enableReinitialize={true}
              initialValues={{
                  //General
                  id: currentUserData.id || '',
                  username: currentUserData.username || '',
                  name: currentUserData.name || '',
                  surname: currentUserData.surname || '',
                  dob: currentUserData.dob || '',
                  position: currentUserData.position || '',
                  notificationValue: currentUserData.notificationValue || 0,
  
                  email: currentUserData.email || '',
                  contactNo: currentUserData.contactNo || '',
                  userRolls: currentUserData.userRolls || userRolls  ,
                  status: currentUserData.status || 'Active',
                  
  
                  
              }}
  </code></pre>