rsample::initial_split has the strata param, but how would I block by >=1 variable?
I'm used to resampling from the mlr package, which includes stratification and blocking. In my case, I would like to stratify by the target variable, but also block by individual, given that there are multiple observations per individual. It's not clear how to block with rsample::initial_split, based on the function docs or the tidymodels tutorial.