Small refactor in argpacker
Small refactor in argpacker

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