title: Invalid JSON text in argument 2 - json_contains in MySQL 5.7.8
body: <p>I have a database with one column that is JSON of strings (ex. ["ART","LIT"], etc.).  I want to search it using <code>json_contains</code>.   </p>
  
  <p>However, when I try:  </p>
  
  <pre><code>json_contains(\`column_name`,"ART")
  </code></pre>
  
  <p>It errors saying:  </p>
  
  <blockquote>
    <p>Invalid JSON text in argument 2 to function json_contains: "Invalid value." at position 0 in 'ART'.</p>
  </blockquote>
  
  <p>Note that <code>json_contains</code> doesn't error with numbers in the place of "ART", just with strings. Any idea what I can do to fix/get around this?</p>