title: Boolean method naming readability
body: <p>Simple question, from a readability standpoint, which method name do you prefer for a boolean method:</p>
  
  <pre><code>public boolean isUserExist(...)
  </code></pre>
  
  <p>or:</p>
  
  <pre><code>public boolean doesUserExist(...)
  </code></pre>
  
  <p>or:</p>
  
  <pre><code>public boolean userExists(...)
  </code></pre>