slightly faster ``_product`` with trivial change
slightly faster ``_product`` with trivial change

jaimahajan1997/sympy,farhaanbukhsh/sympy,bukzor/sympy,beni55/sympy,madan96/sympy,hargup/sympy,beni55/sympy,sahmed95/sympy,kaushik94/sympy,dqnykamp/sympy,meghana1995/sympy,abhiii5459/sympy,wanglongqi/sympy,postvakje/sympy,MechCoder/sympy,pandeyadarsh/sympy,asm666/sympy,yukoba/sympy,AkademieOlympia/sympy,atsao72/sympy,oliverlee/sympy,kevalds51/sympy,jaimahajan1997/sympy,jerli/sympy,lindsayad/sympy,sunny94/temp,kaushik94/sympy,AunShiLord/sympy,atreyv/sympy,saurabhjn76/sympy,lindsayad/sympy,lidavidm/sympy,hargup/sympy,kmacinnis/sympy,drufat/sympy,Vishluck/sympy,postvakje/sympy,shipci/sympy,abloomston/sympy,pandeyadarsh/sympy,mcdaniel67/sympy,drufat/sympy,souravsingh/sympy,moble/sympy,Curious72/sympy,Shaswat27/sympy,wyom/sympy,moble/sympy,Mitchkoens/sympy,debugger22/sympy,Mitchkoens/sympy,vipulroxx/sympy,atsao72/sympy,cswiercz/sympy,jerli/sympy,Titan-C/sympy,VaibhavAgarwalVA/sympy,skidzo/sympy,souravsingh/sympy,sahmed95/sympy,VaibhavAgarwalVA/sympy,meghana1995/sympy,meghana1995/sympy,wanglongqi/sympy,liangjiaxing/sympy,grevutiu-gabriel/sympy,shipci/sympy,beni55/sympy,jbbskinny/sympy,emon10005/sympy,sahilshekhawat/sympy,hargup/sympy,kmacinnis/sympy,Designist/sympy,kumarkrishna/sympy,rahuldan/sympy,MridulS/sympy,vipulroxx/sympy,ahhda/sympy,MridulS/sympy,toolforger/sympy,kumarkrishna/sympy,ChristinaZografou/sympy,aktech/sympy,MechCoder/sympy,farhaanbukhsh/sympy,AkademieOlympia/sympy,Sumith1896/sympy,ChristinaZografou/sympy,sampadsaha5/sympy,kmacinnis/sympy,bukzor/sympy,atreyv/sympy,ahhda/sympy,jbbskinny/sympy,kaichogami/sympy,jbbskinny/sympy,cccfran/sympy,lidavidm/sympy,pbrady/sympy,Arafatk/sympy,hrashk/sympy,Shaswat27/sympy,jerli/sympy,cccfran/sympy,ChristinaZografou/sympy,aktech/sympy,mafiya69/sympy,Davidjohnwilson/sympy,madan96/sympy,abhiii5459/sympy,AunShiLord/sympy,iamutkarshtiwari/sympy,ga7g08/sympy,lidavidm/sympy,kaichogami/sympy,maniteja123/sympy,garvitr/sympy,Gadal/sympy,ga7g08/sympy,yukoba/sympy,AunShiLord/sympy,sampadsaha5/sympy,rahuldan/sympy,yashsharan/sympy,Vishluck/sympy,dqnykamp/sympy,atreyv/sympy,asm666/sympy,pandeyadarsh/sympy,Sumith1896/sympy,sahilshekhawat/sympy,chaffra/sympy,VaibhavAgarwalVA/sympy,pbrady/sympy,skidzo/sympy,oliverlee/sympy,shikil/sympy,kaushik94/sympy,Sumith1896/sympy,chaffra/sympy,asm666/sympy,iamutkarshtiwari/sympy,kevalds51/sympy,atsao72/sympy,yashsharan/sympy,cswiercz/sympy,sunny94/temp,AkademieOlympia/sympy,wyom/sympy,Curious72/sympy,hrashk/sympy,Designist/sympy,liangjiaxing/sympy,mcdaniel67/sympy,Titan-C/sympy,maniteja123/sympy,ahhda/sympy,Mitchkoens/sympy,garvitr/sympy,lindsayad/sympy,liangjiaxing/sympy,rahuldan/sympy,garvitr/sympy,abloomston/sympy,abhiii5459/sympy,emon10005/sympy,MridulS/sympy,shipci/sympy,yukoba/sympy,shikil/sympy,pbrady/sympy,Gadal/sympy,skidzo/sympy,Curious72/sympy,aktech/sympy,cccfran/sympy,hrashk/sympy,madan96/sympy,toolforger/sympy,Davidjohnwilson/sympy,kaichogami/sympy,chaffra/sympy,wanglongqi/sympy,sahilshekhawat/sympy,ga7g08/sympy,MechCoder/sympy,debugger22/sympy,grevutiu-gabriel/sympy,jamesblunt/sympy,Titan-C/sympy,wyom/sympy,mafiya69/sympy,diofant/diofant,Arafatk/sympy,saurabhjn76/sympy,mafiya69/sympy,souravsingh/sympy,oliverlee/sympy,kevalds51/sympy,bukzor/sympy,dqnykamp/sympy,moble/sympy,yashsharan/sympy,debugger22/sympy,shikil/sympy,Davidjohnwilson/sympy,farhaanbukhsh/sympy,postvakje/sympy,mcdaniel67/sympy,kumarkrishna/sympy,Vishluck/sympy,Shaswat27/sympy,abloomston/sympy,Arafatk/sympy,saurabhjn76/sympy,toolforger/sympy,jamesblunt/sympy,jaimahajan1997/sympy,sampadsaha5/sympy,sunny94/temp,maniteja123/sympy,Designist/sympy,cswiercz/sympy,grevutiu-gabriel/sympy,jamesblunt/sympy,iamutkarshtiwari/sympy,Gadal/sympy,emon10005/sympy,skirpichev/omg,sahmed95/sympy,drufat/sympy,vipulroxx/sympy