relax check_base to only check for compatibility
relax check_base to only check for compatibility

astropy/astropy,pllim/astropy,larrybradley/astropy,pllim/astropy,bsipocz/astropy,dhomeier/astropy,saimn/astropy,saimn/astropy,astropy/astropy,bsipocz/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,mhvk/astropy,funbaker/astropy,lpsinger/astropy,mhvk/astropy,astropy/astropy,MSeifert04/astropy,saimn/astropy,DougBurke/astropy,funbaker/astropy,StuartLittlefair/astropy,pllim/astropy,dhomeier/astropy,stargaser/astropy,StuartLittlefair/astropy,saimn/astropy,mhvk/astropy,stargaser/astropy,DougBurke/astropy,StuartLittlefair/astropy,larrybradley/astropy,lpsinger/astropy,saimn/astropy,AustereCuriosity/astropy,funbaker/astropy,larrybradley/astropy,AustereCuriosity/astropy,larrybradley/astropy,dhomeier/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,funbaker/astropy,bsipocz/astropy,mhvk/astropy,pllim/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,dhomeier/astropy,DougBurke/astropy,DougBurke/astropy,astropy/astropy,astropy/astropy,MSeifert04/astropy,AustereCuriosity/astropy,MSeifert04/astropy,stargaser/astropy,StuartLittlefair/astropy,bsipocz/astropy,lpsinger/astropy,dhomeier/astropy,stargaser/astropy,MSeifert04/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy