benchmark_grid should not allow learners with the same ID
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berndbischl commented
tt = tsk("iris")
lrn1 = lrn("classif.rpart", id = "foo")
lrn2 = lrn("classif.rpart", id = "foo")
xs = list(lrn1, lrn2)
bg = benchmark_grid(learners = xs, tasks = tt, resampling = rsmp("holdout"))
br = benchmark(bg)
this should probably be illegal. also then add a test.