Parse the object's properties according to its default types.

def parse(self, obj):
        """
        Parse the object's properties according to its default types.
        """
        for k, default in obj.__class__.defaults.items():
            typ = type(default)
            if typ is str:
                continue
            v = getattr(obj, k)
            if typ is int:
                setattr(obj, k, int(v or default))
            elif typ is float:
                setattr(obj, k, float(v or default))
            elif typ is bool:
                setattr(obj, k, bool(int(v or default)))