title: Store both IPv4 and IPv6 address in a single column
body: <p>I want to be able to store both IPv4 and IPv6 addresses in my table.  What is the most efficient way to store the IP address of a user regardless of whether it is an IPv4 or IPv6 address?</p>
  
  <p>This will be used in a production environment, so future proof'd suggestions are preferred.</p>