val seek_out : [< `This_is_async__Think_about_blocking ] -> [> `This_is_async__Think_about_blocking ]val pos_out : [< `This_is_async__Think_about_blocking ] -> [> `This_is_async__Think_about_blocking ]val out_channel_length : [< `This_is_async__Think_about_blocking ] -> [> `This_is_async__Think_about_blocking ]val seek_in : [< `This_is_async__Think_about_blocking ] -> [> `This_is_async__Think_about_blocking ]val pos_in : [< `This_is_async__Think_about_blocking ] -> [> `This_is_async__Think_about_blocking ]val in_channel_length : [< `This_is_async__Think_about_blocking ] -> [> `This_is_async__Think_about_blocking ]