mlr3pipelines
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POFU seems more broken now
mlr3 doesn't give us an error any more here: https://github.com/mlr-org/mlr3pipelines/blob/6bfe8a8a30767f72395720ef531f8a505e65a903/tests/testthat/test_pipeop_featureunion.R#L105 Need to investigate if this is a problem.