Subscript’s getter and setter

[jjjkkkjjj]

If I don’t use generics in MfArray, subscript’s getter and setter must be handled as Any. However, using Any type causes unexpected error or performance loss.

MfArray<MfType: MfTypable>{
    Hoge
}

//Initialization 
let a = MfArray<Int>([1,2,3])

//Getter and setter
//Note that scalar will be handled only
subscript(indices: Int...) -> MfType{
    hoge
}

//Note that MfArray will be handled only
subscript(mfslices: MfSlice...) -> MfArray{
    fuga
}

[jjjkkkjjj]

MfArray<MfType: MfTypable>{
    Hoge
}

//Initialization 
let a = MfArray<Int>([1,2,3])

I can't understand how above code can be implemented... Alternative solution is below,

subscript(indices: Int...) -> MfArray{
    hoge
}

extension MfArray{
    public var value?:  Any{
          hoge
    }
}

let a = MfArray([[1,2,3], [4,5,6]])
let b = a[2,1].value as! Int

Or Passed Int of array, return Any.

subscript(indices: Int...) -> Any{
    hoge
}
subscript(mfslices: MfSlice...) -> MfArray{
    fuga
}
let b = a[2,1] as! Int //Scalar or MfArray
let c = a[1] as! MfArray //Scalar or MfArray
let d = a[0~,1] //-> MfArray

[jjjkkkjjj]

Or

subscript(indices: Int...) -> MfArray{
    hoge
}
subscript(mfslices: MfSlice...) -> MfArray{
    fuga
}

public func scalar<T: Numeric>(_ type: T) -> T?{
    return self.size == 1 ? self.first! as? T : nil
}

let b = a[2,1].scalar(Int.self)!
guard let c = a[2,1].scalar(Int.self) else{ return }