[xmonad] Issue 576 in xmonad: On FreeBSD Xmonad loses first hotkey sometimes

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Comment #14 on issue 576 by allber... at gmail.com: On FreeBSD Xmonad loses  
first hotkey sometimes
https://code.google.com/p/xmonad/issues/detail?id=576

spawn is handing it upstream to IO via liftIO, as indicated by the MonadIO  
constraint; this should be negligible overhead (nanoseconds if it's not  
optimized away entirely which it should be).

The periodic itimer and SIGALRM handler are used by GHC's runtime for  
thread scheduling, profiler ticks, and IIRC determining when to do a full  
instead of partial garbage collection, among other things.

Also, which function type descriptions are missing? I am looking at  
http://xmonad.org/xmonad-docs/xmonad/XMonad-Core.html#v:spawn

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