invalidate the cache of all subtypes when updating a type's tp_dict (algorithm copied from typeobject.c in Py3)
invalidate the cache of all subtypes when updating a type's tp_dict (algorithm copied from typeobject.c in Py3)

marscher/cython,JelleZijlstra/cython,JelleZijlstra/cython,larsmans/cython,roxyboy/cython,mcanthony/cython,achernet/cython,fabianrost84/cython,hhsprings/cython,da-woods/cython,hpfem/cython,hickford/cython,marscher/cython,roxyboy/cython,fperez/cython,acrispin/cython,mcanthony/cython,andreasvc/cython,mcanthony/cython,andreasvc/cython,c-blake/cython,fperez/cython,hhsprings/cython,c-blake/cython,hpfem/cython,cython/cython,fabianrost84/cython,madjar/cython,ABcDexter/cython,achernet/cython,marscher/cython,hhsprings/cython,larsmans/cython,cython/cython,larsmans/cython,dahebolangkuan/cython,hhsprings/cython,ChristopherHogan/cython,da-woods/cython,scoder/cython,ABcDexter/cython,slonik-az/cython,encukou/cython,encukou/cython,encukou/cython,roxyboy/cython,ABcDexter/cython,dahebolangkuan/cython,ABcDexter/cython,JelleZijlstra/cython,scoder/cython,hpfem/cython,hickford/cython,larsmans/cython,marscher/cython,bzzzz/cython,achernet/cython,rguillebert/CythonCTypesBackend,roxyboy/cython,mcanthony/cython,dahebolangkuan/cython,larsmans/cython,c-blake/cython,hickford/cython,andreasvc/cython,bzzzz/cython,hhsprings/cython,madjar/cython,fperez/cython,rguillebert/CythonCTypesBackend,andreasvc/cython,ChristopherHogan/cython,acrispin/cython,encukou/cython,mrGeen/cython,scoder/cython,c-blake/cython,andreasvc/cython,mrGeen/cython,fperez/cython,roxyboy/cython,acrispin/cython,mrGeen/cython,acrispin/cython,dahebolangkuan/cython,achernet/cython,slonik-az/cython,marscher/cython,mrGeen/cython,fabianrost84/cython,encukou/cython,scoder/cython,ABcDexter/cython,da-woods/cython,mrGeen/cython,madjar/cython,achernet/cython,fabianrost84/cython,da-woods/cython,c-blake/cython,slonik-az/cython,fabianrost84/cython,slonik-az/cython,ChristopherHogan/cython,madjar/cython,dahebolangkuan/cython,JelleZijlstra/cython,cython/cython,bzzzz/cython,rguillebert/CythonCTypesBackend,JelleZijlstra/cython,madjar/cython,acrispin/cython,hickford/cython,mcanthony/cython,rguillebert/CythonCTypesBackend,cython/cython,fperez/cython,bzzzz/cython,hpfem/cython,hpfem/cython,slonik-az/cython,hickford/cython