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Cloning the ArcSwapOption (like the ArcSwap) does not act like a
.clone() on an Arc, instead an entirely new ArcSwap is created with the
same contents. To correctly share the ArcSwap needs to be placed inside
an Arc.
See: 2433d5719b (diff-6c6d94533c44c19bd1416ef17bad1a878e63dca6e98d59181228fbe8f967c62bR6)
Due to this being wrongly used ::clone() was removed from
ArcSwap/ArcSwapOption in 1.0.0.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>