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Enhancement
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Resolution: Fixed
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P4
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None
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b18
The getAndSet to set the attachment object when registering a channel with a Selector is not needed when the attachment object is null.
While in the area, the AtomicReferenceFieldUpdater to update the attachment can be replaced with a VarHandle.
While in the area, the AtomicReferenceFieldUpdater to update the attachment can be replaced with a VarHandle.