title: Efficient way to store tuples in the datastore
body: <p>If I have a pair of floats, is it any more efficient (computationally or storage-wise) to store them as a <code>GeoPtProperty</code> than it would be pickle the tuple and store it as a <code>BlobProperty</code>?</p>
  
  <p>If <code>GeoPt</code> is doing something more clever to keep multiple values in a single property, can it be leveraged for arbitrary data? Can I store the tuple <code>("Johnny", 5)</code> in a single entity property in a similarly efficient manner?</p>