You could also box and then unbox (since covariance is a runtime feature).
F# generally doesn't do variance. In this case, just use Array.map, I expect that
1
Array.map (fun x -> upcast x)
will transform your array of lists into an array of seqs that's acceptable.
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This:
doesn't work, and trying to pass a value of type
to a function
doesn't work too, as so doesn't trying to do the same
upcast.