anchor.diff:          componentMultiplexed.Index.UnregisterMultiplexed multiId |> ignore<bool>
           this.UnregisterCorrelated entityId ecs
   
  -    type Ecs<'w> with
  +    type 'w Ecs with
   
           member this.QualifyMultiplexed<'c when 'c : struct and 'c :> 'c Component> multiId entityId =
               let systemOpt = this.TryIndexSystem<'c, SystemMultiplexed<'c, 'w>> ()
  
positive.code: 
  /// A correlated entity reference.
  /// Slow relative to normal ECS operations, but convenient for one-off uses.
  type [<NoEquality; NoComparison; Struct>] EntityRef<'w> =
      { EntityId : Guid
        EntityEcs : 'w Ecs }
  
  
negative.code:     SystemEvent<obj, 'w> -> 'w System -> 'w Ecs -> 'w option -> 'w option
  
  /// A base system type of an ECS.
  and 'w System (name : string) =
      let pipedKey = Gen.id
      member this.PipedKey with get () = pipedKey
      abstract PipedInit : obj
  