anchor.diff:              this.FreeIndex <- dec this.FreeIndex
               index
   
  -type [<NoEquality; NoComparison>] 't RotationSystem =
  +type [<NoEquality; NoComparison>] RotationSystem =
       private
           { mutable Components : Transform array
             mutable FreeIndex : int
  
positive.code:             if this.FreeIndex < this.Components.Length - 1 then
                  this.Components.[this.FreeIndex] <- comp
                  this.FreeIndex <- inc this.FreeIndex
                  this.FreeIndex - 1
              else
                  let arr = Array.zeroCreate (this.Components.Length * 2)
                  this.Components.CopyTo (arr, 0)
                  this.Components <- arr
                  this.Components.[this.FreeIndex] <- comp
                  this.FreeIndex <- inc this.FreeIndex
                  this.FreeIndex - 1
  
          member this.RemoveComponent index =
              if index <> this.FreeIndex then
  
negative.code:             if this.FreeIndex < this.Components.Length - 1 then
                  this.Components.[this.FreeIndex] <- comp
                  this.FreeIndex <- inc this.FreeIndex
              else
                  let arr = Array.zeroCreate (this.Components.Length * 2)
                  this.Components.CopyTo (arr, 0)
                  this.Components <- arr
                  this.Components.[this.FreeIndex] <- comp
                  this.FreeIndex <- inc this.FreeIndex
              this.FreeIndex - 1
  
          member this.RemoveComponent index =
              if index <> this.FreeIndex then
  