title: how many digits in FLOAT?
body: <p>I've looked all over and can't find this answer.</p>
  
  <p>How many actual digits are there for a MySQL <code>FLOAT</code>?</p>
  
  <p>I know (think?) that it truncates what's in excess of the <code>FLOAT</code>'s 4 byte limit, but what exactly is that?</p>