Car revs up a little before complete stop. Sometimes car lunges forward too depending how I'm braking?

Car revs up a little before complete stop. Like maybe 1-300 rpm. Not much at all. 2011 malibu. I asked my girlfriend who has a 2015 cruze and hers does it too. Am I over thinking it? I just noticed it today while with her. Just got the car a month and half ago
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