Arduino: Using interrupts as flags/latches without any ISR

Using interrupts as flags/latches without any ISR
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(arduino.stackexchange.com/users/91224/nicholas)Nicholas
(arduino.stackexchange.com/users/7508/edgar-bonet)Edgar Bonet
(arduino.stackexchange.com/users/10794/nick-gammon)Nick Gammon
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interrupt isr