Why doesn't InterlockedCompareExchange return changed value?

StackOverflow https://stackoverflow.com/questions/8426375

Question 

LONG __cdecl InterlockedCompareExchange(
  __inout  LONG volatile *Destination,
  __in     LONG Exchange,
  __in     LONG Comparand
);

Return value
The function returns the initial value of the Destination parameter.

Just curious.
Why does InterlockedCompareExchange return initial value? Is there a reason that they designed so?

No correct solution

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