Clarify why we allow subclasses in ndarray.__array_function__
Clarify why we allow subclasses in ndarray.__array_function__

grlee77/numpy,seberg/numpy,endolith/numpy,ahaldane/numpy,jakirkham/numpy,jorisvandenbossche/numpy,abalkin/numpy,mhvk/numpy,numpy/numpy,madphysicist/numpy,anntzer/numpy,rgommers/numpy,charris/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,numpy/numpy,endolith/numpy,mattip/numpy,charris/numpy,endolith/numpy,simongibbons/numpy,anntzer/numpy,MSeifert04/numpy,simongibbons/numpy,simongibbons/numpy,MSeifert04/numpy,grlee77/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,ahaldane/numpy,pdebuyl/numpy,mattip/numpy,charris/numpy,pbrod/numpy,pdebuyl/numpy,jakirkham/numpy,ahaldane/numpy,jakirkham/numpy,ahaldane/numpy,pizzathief/numpy,rgommers/numpy,pizzathief/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,mattip/numpy,pdebuyl/numpy,jorisvandenbossche/numpy,grlee77/numpy,pbrod/numpy,pbrod/numpy,mattip/numpy,simongibbons/numpy,seberg/numpy,madphysicist/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,mhvk/numpy,endolith/numpy,pizzathief/numpy,anntzer/numpy,madphysicist/numpy,rgommers/numpy,mhvk/numpy,ahaldane/numpy,charris/numpy,jorisvandenbossche/numpy,pizzathief/numpy,simongibbons/numpy,mhvk/numpy,abalkin/numpy,seberg/numpy,MSeifert04/numpy,WarrenWeckesser/numpy,pizzathief/numpy,pbrod/numpy,grlee77/numpy,pdebuyl/numpy,seberg/numpy,rgommers/numpy,abalkin/numpy,grlee77/numpy,madphysicist/numpy,anntzer/numpy,madphysicist/numpy,jakirkham/numpy,numpy/numpy,pbrod/numpy,jakirkham/numpy,mhvk/numpy,numpy/numpy