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See GenericMappingTools/gmt#7171 and GenericMappingTools/gmt#7172 for context.
The PyGMT team may wish to check what other modules modify input. I do not think we will rewrite all modules to internally do this though, in that case simpler to pass the DUPLICATE flag.
Originally posted by @PaulWessel in GenericMappingTools/gmt#7172 (comment)