Create an F# sequence using reflection

make-seq-of.fs

let makeSeqOf itemType (items : obj list) = 

        let seqType = 
            makeGenericType
            <| typedefof<List<_>>
            <| [ itemType; ]

        let sequence = 
            Activator.CreateInstance seqType

        let add = 

            let addMethod = 
                seqType.GetMethod ("Add")           
            
            fun item ->
                addMethod.Invoke (sequence, [| item; |]) 
                |> ignore

        items
        |> List.iter add

        sequence