Question about Using Groups in z5

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I have a question about the z5 library and the intended way to use Groups. For Datasets, in the factory.hxx file, there’s an openDataset() function to get an existing dataset, and createDataset() functions to create new datasets, all of which return unique_ptrs to the relevant objects. For Groups, though, there’s only createGroup(), which returns void. What’s the intended way to access existing Groups, create new Groups, and get the relevant pointers/handles?