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`make_learner(fix.factors.prediction = TRUE)` does not have an effect
See this SO question: https://stackoverflow.com/questions/56553479/r-predicting-with-new-factor-levels-in-mlr-with-regr-svm-task/56587590#56587590
I did a very dirty fix in the fix-factors
branch that works for this example but probably not if more factor levels in newdata
have missing values.
In fact, ,fix.factors.prediction
sets the missing level to NA
rather than to a level existing in the training data.