anchor.diff:                  content.Headers.Add("Content-Disposition", "form-data; name=\"operations\"")
                   content
               content.Add(operationContent)
  -            use mapContent =
  +            let mapContent =
                   let files =
                       files
                       |> Array.mapi (fun ix (name, _) -> ix.ToString(), JsonValue.Array [| JsonValue.String ("variables." + name) |])
  
positive.code:         async {
              let client = connection.Client
              let boundary = "----GraphQLProviderBoundary" + (Guid.NewGuid().ToString("N"))
              use content = new MultipartContent("form-data", boundary)
              let files = 
                  let rec chooseFileValues (name: string, value : obj) =
                      match value with
  
negative.code:                 request.Variables
                  |> Array.choose chooseFileValues
                  |> Array.collect id
              let operationContent = 
                  let variables = 
                      match request.Variables with
                      | null | [||] -> JsonValue.Null
  