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Nicely timed question! Im just up to the chapter on composition in the book Im writing, Vector Programming in Q, and I need to settle a few questions about it myself. For example, is there ever a reason to prefer Compose to a train suffixed by
@or::?Nick Psaris commented recently that he favours
::because it composes directly rather than forming a projection. (I doubt the evaluation overhead is significant, but I get the point.)