delayMicroseconds(0) appears to malfunction and return (delay really) a much larger value, instead of returning asap. I discovered this experimenting with a sound synthesis program with a variable for the delayMicroseconds param. Maybe this should be in the docs? I'm pretty sure we don't want to …

delayMicroseconds(0)

system November 15, 2007, 1:12pm 14

Then that's where the check needs to be - not in the library!

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