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f2b48e565c
Rename cloning methods of class Item and its descendants in the following way: (from) (to) do_build_clone -> deep_copy build_clone -> deep_copy_with_checks do_get_copy -> shallow_copy get_copy -> shallow_copy_with_checks to better reflect their functionality. Also make Item::deep_copy() and shallow_copy() protected. Outside users should call deep_copy_with_checks() and shallow_copy_with_checks().