Fixes clang compiler warning: /Users/thomas/Development/xlnt/source/detail/serialization/xlsx_producer.cpp:680:27: 34 enumeration values not handled in switch: 'unknown', 'core_properties', 'extended_properties'.... Also cleans up some nearby code and adds comments.
Fixes clang compiler warning:
/Users/thomas/Development/xlnt/source/detail/serialization/xlsx_producer.cpp:680:27: 34 enumeration values not handled in switch: 'unknown', 'core_properties', 'extended_properties'...
. Also cleans up some nearby code and adds comments.