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I implemented a (customizable) delay for same-card-swipes as I had some issues with my 1,5year old daughter who swipes differently than me... She leaves the card on the reader while moving it slightly resulting in "same card" recognition over and over again. A customizable delay between actions for same-card swipes fixed that without much code modification. I left the initial delay to 0 seconds to not make a difference for other users while allowing users like me to modify this setting if need be.