[plt-scheme] semaphore-value

Hi
A question: Is there a reason for not providing a procedure like (semaphore-count sema) --> current value of the semaphore counter? It seems rather easy to implement, but I rather like not to poke in MzScheme's C code (sema.c). Of course the returned value may be outdated by the time it is returned, but that's no problem.
Greetings, Jos Koot.
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