fixed: bug in comparison operators: - replaced isInstanceOf with isKindOf   this only did work due to a bug in isInstanceOf which in fact was an   "isKindOf' until yesterday.
fixed: bug in comparison operators: - replaced isInstanceOf with isKindOf
  this only did work due to a bug in isInstanceOf which in fact was an
  "isKindOf' until yesterday.

tkemmer/ball,tkemmer/ball,tkemmer/ball,tkemmer/ball,tkemmer/ball,tkemmer/ball