title: Cannot downgrade from MySQL 8.0.12 to earlier version
body: <p>I've been searching around and haven't been able to find out how to downgrade my MySQL version. I've tried <code>brew info MySQL</code> then <code>brew switch MySQL 5.7.21</code> but it says it's not in the cellar. </p>
  
  <p>I followed a guide running <code>brew install mysql@5.7</code> but when I check the -v it says its an unknown command. </p>
  
  <p>let me know if I missed any details. this is my first time reaching out. </p>