String subtyping fix from Jason Evans
String subtyping fix from Jason Evans

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