anchor.diff:              | (false, _) -> result <- false
           result
   
  -    static member dict entries = dictPlus<string, Subquery> HashIdentity.Structural entries
  +    static member dict entries = dictPlus<string, Subquery> StringComparer.Ordinal entries
       static member singleton subqueryName subquery = Subquery.dict [(subqueryName, subquery)]
       static member zero = Subquery.dict []
   
  
positive.code:         this.FreeIndex index
  
      member this.GetComponents index =
          let comps = dictPlus<string, obj> HashIdentity.Structural []
          for storeEntry in stores do
              comps.Add (storeEntry.Key, storeEntry.Value.[index])
          comps
  
negative.code: open System.Threading.Tasks
  open Prime
  
  // TODO: 3D: make sure to use TryAdd in the appropriate places.
  // TODO: 3D: create try functions where applicable and do error-checking where not.
  
  /// Allows a value to always pass as equal with another of its same type.
  type [<CustomEquality; NoComparison; Struct>] 'a AlwaysEqual =
  