Make Array-of-SArray op
Number infer the right output Array type
#20
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For some reason, there's special rules using Base.promote_op to infer
the correct type for operations involving Number and arrays of other
types. This means we need to overload promote_op or we'll get an Array
of Any in these cases.
See SimonDanisch/FixedSizeArrays.jl#156 for a similar issue.