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Returning the value allows for better high-water tracking without running into edge cases like the following: 0. The counter is at value X 1. Increment the value (X+1) 2. The value is decreased multiple times in another threads (X+1-Y) 3. Get the value (X+1-Y) 4. Update-if-greater misses the X+1 value which should have been the high-water |
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