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Although attributes are normally only shallow-copied, it is useful to allow the channel attribute to be deep copied when the parent logger is copied. This would eliminate the unexpected effect of modifying the channel in the copy, as it would otherwise affect the original logger. This commit makes copy constructor and assignment of the channel loggers deep-copy the channel value. The problem was reported in: https://stackoverflow.com/questions/66120806/deep-copy-of-boost-logger. Note that any other attributes that might have been added to the logger are still shallow copied.