bug in object IDs ? O vs 0

["brian remedios" <brianremedios gmail com>]

I'm working on a Dia diagram generator and I noticed that the object IDs being generated seem numerical but instead of
a leading zero they are prefixed with an 'O' (the letter) instead:

    <dia:object type="Geometric - Perfect Circle" version="0" id="O1">

Is this a typo in the code or intentional?  It doesn't seem to change per any of the basic object types so I'm not sure why
Dia does this. It would be better as a pure integer I think.

Brian