anchor.diff:  let text (str : string) : HttpHandler =
       let bytes = Encoding.UTF8.GetBytes str
       fun (next : HttpFunc) (ctx : HttpContext) ->
  -        ctx.SetContentType "text/plain"
  +        ctx.SetContentType "text/plain; charset=utf-8"
           ctx.WriteBytesAsync bytes
   
   /// **Description**
  
positive.code:     /// Task of `Some HttpContext` after writing to the body of the response.
      ///
      member this.WriteJsonAsync<'T> (dataObj : 'T) =
          this.SetContentType "application/json"
          let serializer = this.GetJsonSerializer()
          serializer.SerializeToBytes dataObj
          |> this.WriteBytesAsync
  
negative.code:     /// Task of `Some HttpContext` after writing to the body of the response.
      ///
      member this.WriteHtmlStringAsync (html : string) =
          this.SetContentType "text/html; charset=utf-8"
          this.WriteStringAsync html
  
      /// **Description**
  