Might be better to use `as.<type_of>` or `as.<typeof>` as you risk confusing things here with classes in the OOP sense and also because `class` is not strictly correct when referring to the atomic types. Admittedly, it gets complex fast, because in say `as.matrix()` the `matrix` part *is* the class, there is no typeof `"matrix"`.

Go with whatever you feel the students will be most comfortable with.