Optimize BaseSelector.modify(). Patch by Arnaud Faure (without tests).
Optimize BaseSelector.modify(). Patch by Arnaud Faure (without tests).

vxgmichel/asyncio,vxgmichel/asyncio,ajdavis/asyncio,jashandeep-sohi/asyncio,ajdavis/asyncio,Martiusweb/asyncio,gvanrossum/asyncio,haypo/trollius,vxgmichel/asyncio,gvanrossum/asyncio,manipopopo/asyncio,ajdavis/asyncio,jashandeep-sohi/asyncio,gvanrossum/asyncio,jashandeep-sohi/asyncio,1st1/asyncio,Martiusweb/asyncio,haypo/trollius,gsb-eng/asyncio,gsb-eng/asyncio,haypo/trollius,fallen/asyncio,1st1/asyncio,Martiusweb/asyncio,1st1/asyncio,manipopopo/asyncio,manipopopo/asyncio,gsb-eng/asyncio,fallen/asyncio,fallen/asyncio