PYTHON-1244 - Fix signed/unsigned comparison
PYTHON-1244 - Fix signed/unsigned comparison

ShaneHarvey/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver,aherlihy/mongo-python-driver,ramnes/mongo-python-driver,ramnes/mongo-python-driver,aherlihy/mongo-python-driver,ShaneHarvey/mongo-python-driver,ramnes/mongo-python-driver,aherlihy/mongo-python-driver,ShaneHarvey/mongo-python-driver