Dropping data variables in InferenceData

[mortonjt]

Just out of curiosity, it is possible to drop data variables from InferenceData objects? For instance, one may want to drop all of the transformed variables from a stan run to save memory. I see that there is a isel method, but supporting something like xarray.Dataset.drop would be more straightforward.

EDIT : I found that just deleting variables can resolve this, for instance

del inf['posterior']['useless_variable']

[OriolAbril]

As a starting point you can do inf["posterior"].drop() as all groups are xarray datasets, but we could extend the drop method to work with inf.drop() directly so you can drop variables from both posterior and prior at the same time for example