A quick and dirty hack might be to replace:

    val = self[k]

with:

    val = self[k]
    val._value = self._klass.get(self._nodeid, k)


It would seem to solve the immediate probably... but probably not in the most desirable of ways :D

I'm open to suggestions that can avoid a large block of if/elif/else statements to handle all property type usecases.