Fix __deep_clone__ on a backreference
Fix __deep_clone__ on a backreference

Treat a string argument to backrefernce differntly than a Hash

jeff-hykin/better-cpp-syntax,jeff-hykin/better-cpp-syntax,jeff-hykin/better-cpp-syntax,jeff-hykin/better-cpp-syntax,jeff-hykin/better-cpp-syntax,jeff-hykin/better-cpp-syntax