Pd Vanilla 0.44
Max OS X 10.8.2
When I am using keyup object, while I am still holding down the key, it automatically triggers the keyup object after 1 sec. If I release the key earlier (within 1 sec) it works as expected.
this is probably a feature of your OS ("key repeat"), where a held-down key keeps re-triggering after an initial timeout (so that if you want to type "oooooooooooooooooooo" you don't have to press "o" 20 times). it does so by simulating a repeatedly pressed key, so Pd really doesn't know that the key was not released at all.
check the documentation of your OS how to turn this off.
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This was found on a similar bug report from 2008 (!)
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This is a bug because the auto-repeat behavior is different on each platform. Not only I consider this a bug, but Miller as well:
I noticed this bug today in a lab I was running. It seems like the link suggested above
It looks like there are some potential solution in the link above. That being said I'm not sure any of them are perfect.