title: How to make Mongoose query case insensitive?
body: <pre><code>      const userExists = await Users.exists({ username: username });
  </code></pre>
  <p>How can I make this userExists boolean case insensitive?</p>
  <p>**</p>
  <p>It is resulting false if I enter anurag,Anurag,aNurag</p>
  <p>**</p>