Port setup checks from multidict repo
Port setup checks from multidict repo

arthurdarcet/aiohttp,Eyepea/aiohttp,KeepSafe/aiohttp,arthurdarcet/aiohttp,playpauseandstop/aiohttp,hellysmile/aiohttp,KeepSafe/aiohttp,pfreixes/aiohttp,rutsky/aiohttp,KeepSafe/aiohttp,hellysmile/aiohttp,arthurdarcet/aiohttp,rutsky/aiohttp,rutsky/aiohttp,pfreixes/aiohttp