def update(self, duration):
        if duration >= 0:
            self.histogram.update(duration)
            self.meter.mark()
Maps dictionary keys to values for assignment.  Called for
dataset/ETHPy150Open dreid/yunomi/yunomi/core/timer.py/Timer.update--crossover with--dataset/ETHPy150Open ejeschke/ginga/ginga/misc/Bunch.py/threadSafeBunch.setitem