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* Make stopWaveform call interrupt callable Match the behavior of pre-2.4.2 PWM by allowing stopWaveform to be called from an interrupt. Fixes #5247 * Move to O2, save ~500 bytes of code The actual runtime difference of -O2 vs -O3 is quite small, but -O3 takes ~500 more bytes of code (~300 more in IRAM, ~200 more in PMEM).