anchor.diff:  
   
   [.upgrade-recipe-minor]
  -=== Bendable Score: method `isFeasible()` fixed
  +=== `Bendable*Score`: method `isFeasible()` fixed
   
   A bendable score with at least 2 hard score levels is now infeasible
   if any of those hard levels is negative, even if one of them is positive (1 or higher).
  
positive.code: The ID must never be null and must be unique per class (no need to be globally unique).
  
  This enables the use of multi-threaded solvers (such as Partitioned Search)
  and makes it easier to implement a real-time planning `ProblemFactChange` by using `ScoreDirector.locateWorkingObject()`.
  
  Before in `*.java`:
  [source, java]
  
negative.code: are recommended to be separated by a `;` character instead of a `,` character.
  
  
  [.upgrade-recipe-minor]
  ===  Custom `Score`: implement `isCompatibleArithmeticArgument()`
  
  An `AbstractScore` no longer implements the `Score` interface method `isCompatibleArithmeticArgument()` (which is still there).
  