minor speed optimization for PGArray bind & result processors
minor speed optimization for PGArray bind & result processors

brianv0/sqlalchemy,sandan/sqlalchemy,wfxiang08/sqlalchemy,zzzeek/sqlalchemy,276361270/sqlalchemy,WinterNis/sqlalchemy,Cito/sqlalchemy,robin900/sqlalchemy,Cito/sqlalchemy,wujuguang/sqlalchemy,inspirehep/sqlalchemy,Cito/sqlalchemy,276361270/sqlalchemy,graingert/sqlalchemy,davidjb/sqlalchemy,WinterNis/sqlalchemy,EvaSDK/sqlalchemy,ThiefMaster/sqlalchemy,sandan/sqlalchemy,davidfraser/sqlalchemy,alex/sqlalchemy,wfxiang08/sqlalchemy,j5int/sqlalchemy,bdupharm/sqlalchemy,elelianghh/sqlalchemy,alex/sqlalchemy,bootandy/sqlalchemy,elelianghh/sqlalchemy,davidjb/sqlalchemy,sqlalchemy/sqlalchemy,Akrog/sqlalchemy,monetate/sqlalchemy,pdufour/sqlalchemy,olemis/sqlalchemy,dstufft/sqlalchemy,halfcrazy/sqlalchemy,halfcrazy/sqlalchemy,inspirehep/sqlalchemy,olemis/sqlalchemy,monetate/sqlalchemy,itkovian/sqlalchemy,wujuguang/sqlalchemy,epa/sqlalchemy,bdupharm/sqlalchemy,hsum/sqlalchemy,brianv0/sqlalchemy,davidfraser/sqlalchemy,graingert/sqlalchemy,epa/sqlalchemy,Akrog/sqlalchemy,ThiefMaster/sqlalchemy,pdufour/sqlalchemy,j5int/sqlalchemy,robin900/sqlalchemy,alex/sqlalchemy,hsum/sqlalchemy,bootandy/sqlalchemy,itkovian/sqlalchemy,dstufft/sqlalchemy,EvaSDK/sqlalchemy