Minimal dapper in F#

Dapper.fs

module DapperFSharp =
    open System.Data.SqlClient
    open System.Dynamic
    open System.Collections.Generic
    open Dapper

    let dapperQuery<'Result> (query:string) (connection:SqlConnection) =
        connection.Query<'Result>(query)
    
    let dapperParametrizedQuery<'Result> (query:string) (param:obj) (connection:SqlConnection) : 'Result seq =
        connection.Query<'Result>(query, param)
    
    let dapperMapParametrizedQuery<'Result> (query:string) (param : Map<string,_>) (connection:SqlConnection) : 'Result seq =
        let expando = ExpandoObject()
        let expandoDictionary = expando :> IDictionary<string,obj>
        for paramValue in param do
            expandoDictionary.Add(paramValue.Key, paramValue.Value :> obj)
    
        connection |> dapperParametrizedQuery query expando

Sample.fsx

type User = { UserId:string }

let getUsers connection =
    connection
    |> dapperQuery<User> "SELECT UserID From tbUser"
    
let getUser userId connection =
    connection
    |> dapperMapParametrizedQuery<User> "SELECT UserID From tbUser WHERE UserId = @UserId" (Map ["UserId", userId])
    |> Seq.head

type UserSelectArgs = { SelectedUserId:string}

let getUser' userId connection =
    connection
    |> dapperParametrizedQuery<User> "SELECT UserID From tbUser WHERE UserId = @SelectedUserId" {SelectedUserId=userId}
    |> Seq.head