ENH: Provide consistency with C++11 core guidelines
ENH: Provide consistency with C++11 core guidelines

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Rc-zero

"Defining only the move operations or only the copy operations would have
the same effect here, but stating the intent explicitly for each special
member makes it more obvious to the reader."

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