def flush(self):
        self.persistent.clear()
        self.ephemeral.clear()
Validate StringField allowing for str and unicode.
dataset/ETHPy150Open lektor/lektor/lektor/db.py/RecordCache.flush--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/protorpc/protorpc/messages.py/StringField.validate_element