Adding constant prop for arrays like this would be quite easy, but would have significant compile time cost, so we don’t do that. If you want to manually opt into that kind of thing you can use StaticArrays (or tuples as was previously mentioned). We are planning a bit of an Array overhaul for 2.0, at which point Array may be closer to StaticArrays and this kind of optimization may happen, but for now, Array is just the wrong data structure for what you’re looking for here.
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