@NotNull
  @TestOnly
  public List<ObjectReference> getAllReferrers(@NotNull ObjectReference value) {
    return myReferrers.get(myReversedMap.get(value)).stream()
      .distinct()
      .map(ReferringObject::getReference)
      .filter(ref -> ref != null)
      .collect(Collectors.toList());
  }
@NotNull
  @TestOnly
  public List<ObjectReference> getAllReferrers(@NotNull ObjectReference value)