anchor.diff:  
       override this.ToString() =
           let append (s: string) (sb: StringBuilder) = sb.Append s
  -        let appendIfTrue p s sb =
  -            if p then append s sb else sb
  -        let appendIfNotNullOrWhiteSpace p s (sb: StringBuilder) =
  -            if String.IsNullOrWhiteSpace p |> not
  -            then sprintf "%s%s " s p |> sb.Append
  +        let appendIfTrue value s sb =
  +            if value then append s sb else sb
  +        let appendIfNotNullOrWhiteSpace value s (sb: StringBuilder) =
  +            if String.IsNullOrWhiteSpace value |> not
  +            then sprintf "%s%s " s value |> sb.Append
  +            else sb
  +        let appendIfNotEqual other value s (sb: StringBuilder) =
  +            if other = value
  +            then sprintf "%s%A " s value |> sb.Append
               else sb
           let appendList list s (sb: StringBuilder) =
               let filtered = list |> List.filter (String.IsNullOrWhiteSpace >> not)
  
positive.code:         StringBuilder()
          |> appendIfTrue this.Debug "--debug "
          |> appendIfTrue this.Parallel "--parallel "
          |> appendIfTrue this.FailOnFocusedTests "--fail-on-focused-tests "
          |> appendIfTrue this.Summary "--summary "
          |> appendIfTrue (not this.Parallel) "--sequential "
          |> appendIfTrue this.PrintVersion "--version "
          |> appendIfTrue this.ListTests "--list-tests "
  
negative.code: /// CLI parameters available if you use Tests.runTestsInAssembly defaultConfig argv in your code:
  type ExpectoParams =
      {
        /// Extra verbose output for your tests.
        Debug : bool
        /// Run all tests in parallel. Default is true.
        Parallel : bool
        /// Number of parallel workers (defaults to the number of logical processors).
        ParallelWorkers : int
        /// Prints out summary after all tests are finished.
        Summary : bool
        /// Prints out summary after all tests are finished including their source code location.
        SummaryLocation : bool
        /// Fails the build if focused tests exist. Default is true
        FailOnFocusedTests : bool
        /// Filter a specific hierarchy to run.
        Filter : string
        /// Filter a specific test case to run.
        FilterTestCase : string
        /// Filter a specific test list to run.
  