title: unsigned integer field in django
body: <p>Any idea how to use an <strong>unsigned integer field</strong> in Django? By this I mean a field inside a model with a range from 0 to 4294967295 and stores 32 bit. This definition excludes the <code>PositiveIntegerField</code> because it only has a range from 0 to 2147483647. I also prefer not to use a <code>bigIntegerField</code> as that would be a huge waste of memory.</p>