It could maybe work in some cases to convert from Array{T, N} to Array{Union{T, Missing}, N}, but basically only when realloc is able to use the same memory range. It’s not that terrible though to just malloc a new region big enough for Union{T, Missing} and then copy everything over. We probably need a little extra machinery in Base though to handle this though. Would you mind opening an issue about it? It should also be pretty straightforward to have the opposite conversion, Array{Union{T, Missing}, N} to Array{T, N} w/o copying.
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