don't assume type(frame.data) == frame.representation_type
don't assume type(frame.data) == frame.representation_type

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