As per title: let's say I have a dataset d1 with a variable X which is Multiclass{10}, but now I get another smaller dataset d2 in which X only has 7 of the 10 classes present in d1. If I just coerce(d2, :X => Multiclass) in then it will be a Multiclass{7} and then downstream transformations/functionality in things like the MLJ.Pipeline will break. Can I specify the number of classes in Multiclass when coercing, along with how to assign a class, such that X in d2 could be coerced to the same scitype as X in d1?