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[atomics.types.operations] Clarify compare_exchange note
We now have explicit floating-point specializations for atomic. We had cmpxchg for them before, but people are now looking at increased usage and are confused about what the behavior is for `-0.` with `0.`, as well as NaNs. I propose clarifying the note to make this extra clear. This is a note and is therefore purely editorial, and would be a waste of SG1's time.
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