It looks like in this case the number of objects is small, so a tuple-based approach is probably best. Just wanted to note that in the case that the number of objects is large, but the number of different types is a lot smaller, you can use a tuple of concretely typed Vectors, unroll the loop over the different vectors, but then iterate over each of the vectors as normal. This approach is automated in TypeSortedCollections.jl (I’m the main author). See also Looping over different types with common behavior - #5 by tkoolen.
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