anchor.diff:        TimeOut = TimeSpan.FromMinutes 5.
         Retries = 5
         Sources = []
  -      Version = None
  +      Version = ""
         ExcludeVersion = false
         OutputDirectory = "./packages/"
         Prerelease = false
  
positive.code: /// [omit]
  let buildArgs (param: NugetInstallParams) =
      [   param.Sources |> argList "source"
          (match param.Version with | Some version -> sprintf "-version \"%s\"" version | _ -> "")
          (if param.OutputDirectory <> "" then sprintf "-outputdirectory \"%s\"" param.OutputDirectory else "")
          (match param.Verbosity with | Quiet -> "quiet" | Detailed -> "detailed" | Normal -> "")
          (if param.ExcludeVersion then "-excludeversion" else "")
  
negative.code:       /// Nuget feeds to search updates in. Use default if empty.
        Sources: string list
        /// The version of the package to install.
        Version: string
        /// If set, the destination directory will contain only the package name, not the version number. Default `false`.
        ExcludeVersion: bool
        /// Allows updating to prerelease versions. Default `false`.
  