Allow reading back callbacks set to handles
Allow reading back callbacks set to handles

brimworks/luv,xpol/luv,xpol/luv,joerg-krause/luv,kidaa/luv,zhaozg/luv,RomeroMalaquias/luv,NanXiao/luv,RomeroMalaquias/luv,zhaozg/luv,leecrest/luv,DBarney/luv,mkschreder/luv,mkschreder/luv,luvit/luv,kidaa/luv,luvit/luv,RomeroMalaquias/luv,daurnimator/luv,daurnimator/luv,joerg-krause/luv,leecrest/luv,daurnimator/luv,DBarney/luv,brimworks/luv,NanXiao/luv