When compiled under ARC, NSTimer should have a weak, not strong, reference
to its target.  When the timer starts to fire, check the reference for nil
and invalidate itself.  Come on guys, how hard is that?  You wouldn¹t even
have to keep a reference to it, unless you want to invalidate it before the
target deallocates.

Trying to invalidate an NSTimer in dealloc doesn¹t work, because dealloc
will never get called due to the strong reference in NSTimer.  Leaks galore.
Lots of mentions of this when you Google it for retain cycles.

You can¹t subclass NSTimer, but you can wrap it.  I did this in iOS to
create a suspendable timer.  Maybe I can do something similar for Mac to
make it behave properly.
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