anchor.diff:              if Option.isNone systemOpt then failwith ("Could not find expected system '" + systemName + "'.")
               let system = Option.get systemOpt
               let simplex = system.IndexMultiplexed multiId entityId
  +            &simplex.Simplex
  +
  +        member this.ReadMultiplexed<'c when 'c : struct and 'c :> 'c Component> multiId entityId =
  +            let systemName = typeof<'c>.Name
  +            let systemOpt = this.TryIndexSystem<SystemMultiplexed<'c, 'w>> systemName
  +            if Option.isNone systemOpt then failwith ("Could not find expected system '" + systemName + "'.")
  +            let system = Option.get systemOpt
  +            let simplex = system.ReadMultiplexed multiId entityId
               &simplex.Simplex
   
           member this.RegisterMultiplexed<'c when 'c : struct and 'c :> 'c Component> comp multiId entityId =
  
positive.code: /// NOTE: Inlined everything for speed.
  and [<NoEquality; NoComparison; Struct>] ComponentRef<'c when 'c : struct and 'c :> 'c Component> =
      { ComponentIndex : int
        ComponentArefWritable : 'c ArrayRef
        ComponentArefReadOnly : 'c ArrayRef }
  
      member inline this.Index
          with get () = &this.ComponentArefWritable.[this.ComponentIndex]
  
      member inline this.Assign value =
          this.ComponentArefWritable.[this.ComponentIndex] <- value
  
      member inline this.Read
          with get () =
  
negative.code:         let componentMultiplexed = this.IndexCorrelated entityId
          componentMultiplexed.Index.Simplexes.[multiId]
  
      member this.ReadMultiplexed multiId entityId =
          let componentMultiplexed = this.IndexCorrelated entityId
          componentMultiplexed.Read.Simplexes.[multiId]
  
      member this.RegisterMultiplexed comp multiId entityId ecs =
          let entityId = this.RegisterCorrelated Unchecked.defaultof<_> entityId ecs
          let componentMultiplexed = this.IndexCorrelated entityId
  