Feature request: convert between Array{Union{T, Missing}, N} and Array{T, N} without copying

[piever]

As discussed in this thread , it'd be useful to allow converting between Array{Union{T, Missing}, N} and Array{T, N} without copying the data whenever possible. From (my understanding of) the discourse discussion, it seems that conversion fromArray{Union{T, Missing}, N} to Array{T, N} should always be possible without copying whereas the other direction depends on whether the already allocated region is big enough to fit the wider type.

[bkamins]

bump - @vtjnash do you know who knows enough about Julia internals to implement this? (as the request popped up again recently) Or could you please point me to the documentation/section of the internals that are related to the required changes? Thank you!