Fix slice object can contain None and refct
Fix slice object can contain None and refct

stefanseefeld/numba,pitrou/numba,pitrou/numba,sklam/numba,pitrou/numba,stefanseefeld/numba,numba/numba,pombredanne/numba,pombredanne/numba,pombredanne/numba,seibert/numba,pombredanne/numba,ssarangi/numba,stuartarchibald/numba,IntelLabs/numba,sklam/numba,GaZ3ll3/numba,gdementen/numba,cpcloud/numba,GaZ3ll3/numba,stuartarchibald/numba,numba/numba,pitrou/numba,sklam/numba,gmarkall/numba,stuartarchibald/numba,ssarangi/numba,gdementen/numba,jriehl/numba,stonebig/numba,ssarangi/numba,IntelLabs/numba,IntelLabs/numba,seibert/numba,ssarangi/numba,jriehl/numba,GaZ3ll3/numba,cpcloud/numba,cpcloud/numba,IntelLabs/numba,pitrou/numba,stonebig/numba,stuartarchibald/numba,gmarkall/numba,pombredanne/numba,stefanseefeld/numba,cpcloud/numba,seibert/numba,gdementen/numba,numba/numba,IntelLabs/numba,cpcloud/numba,GaZ3ll3/numba,jriehl/numba,gmarkall/numba,stuartarchibald/numba,numba/numba,GaZ3ll3/numba,gmarkall/numba,sklam/numba,sklam/numba,jriehl/numba,gdementen/numba,ssarangi/numba,stefanseefeld/numba,numba/numba,stonebig/numba,gdementen/numba,gmarkall/numba,seibert/numba,seibert/numba,stefanseefeld/numba,stonebig/numba,jriehl/numba,stonebig/numba