module String =
    /// Converts a string into a list of characters.
    let explode (s:string) =
        [for c in s -> c]

    /// Converts a list of characters into a string.
    let implode (xs:char list) =
        let sb = System.Text.StringBuilder(xs.Length)
        xs |> List.iter (sb.Append >> ignore)
        sb.ToString()