I don't think you can - there's no cast operator
I would honestly skip on using Array, it's untyped and will cause a fairly large amount of garbage when boxing/unboxing your ints
Instead, use a List., like so:
import System.Collections.Generic;
private var possibleIndices = new List.();
You can then use .Add to add things in, and access items with possibleIndices[i] as before
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