Make the expand heuristic in Poly a little smarter
Make the expand heuristic in Poly a little smarter

kmacinnis/sympy,lindsayad/sympy,atsao72/sympy,Shaswat27/sympy,flacjacket/sympy,shipci/sympy,ahhda/sympy,pbrady/sympy,pandeyadarsh/sympy,wyom/sympy,madan96/sympy,abloomston/sympy,skidzo/sympy,jerli/sympy,emon10005/sympy,skidzo/sympy,MechCoder/sympy,debugger22/sympy,iamutkarshtiwari/sympy,kaushik94/sympy,jbbskinny/sympy,jaimahajan1997/sympy,asm666/sympy,bukzor/sympy,drufat/sympy,wanglongqi/sympy,shikil/sympy,skirpichev/omg,pbrady/sympy,atreyv/sympy,liangjiaxing/sympy,grevutiu-gabriel/sympy,souravsingh/sympy,jbbskinny/sympy,sahmed95/sympy,kaushik94/sympy,abloomston/sympy,jerli/sympy,yukoba/sympy,dqnykamp/sympy,abhiii5459/sympy,wyom/sympy,kumarkrishna/sympy,jamesblunt/sympy,rahuldan/sympy,MechCoder/sympy,jaimahajan1997/sympy,dqnykamp/sympy,ChristinaZografou/sympy,bukzor/sympy,cccfran/sympy,kaushik94/sympy,hrashk/sympy,MridulS/sympy,yashsharan/sympy,AkademieOlympia/sympy,oliverlee/sympy,chaffra/sympy,Davidjohnwilson/sympy,vipulroxx/sympy,cswiercz/sympy,Curious72/sympy,sampadsaha5/sympy,MridulS/sympy,garvitr/sympy,Sumith1896/sympy,bukzor/sympy,Shaswat27/sympy,sahmed95/sympy,jbbskinny/sympy,jamesblunt/sympy,sahilshekhawat/sympy,postvakje/sympy,maniteja123/sympy,souravsingh/sympy,oliverlee/sympy,VaibhavAgarwalVA/sympy,kevalds51/sympy,Mitchkoens/sympy,Titan-C/sympy,saurabhjn76/sympy,ga7g08/sympy,kumarkrishna/sympy,Curious72/sympy,Arafatk/sympy,garvitr/sympy,yashsharan/sympy,toolforger/sympy,maniteja123/sympy,shikil/sympy,aktech/sympy,kevalds51/sympy,emon10005/sympy,ahhda/sympy,vipulroxx/sympy,Vishluck/sympy,lindsayad/sympy,srjoglekar246/sympy,vipulroxx/sympy,kaichogami/sympy,MechCoder/sympy,VaibhavAgarwalVA/sympy,wyom/sympy,cswiercz/sympy,AkademieOlympia/sympy,farhaanbukhsh/sympy,Gadal/sympy,abloomston/sympy,Mitchkoens/sympy,madan96/sympy,ga7g08/sympy,Arafatk/sympy,lidavidm/sympy,moble/sympy,beni55/sympy,madan96/sympy,meghana1995/sympy,AunShiLord/sympy,AkademieOlympia/sympy,rahuldan/sympy,Designist/sympy,pbrady/sympy,lidavidm/sympy,debugger22/sympy,aktech/sympy,emon10005/sympy,Vishluck/sympy,asm666/sympy,Arafatk/sympy,hargup/sympy,Gadal/sympy,yukoba/sympy,sunny94/temp,shikil/sympy,shipci/sympy,beni55/sympy,Mitchkoens/sympy,drufat/sympy,sahilshekhawat/sympy,atsao72/sympy,kmacinnis/sympy,yukoba/sympy,AunShiLord/sympy,mafiya69/sympy,sahilshekhawat/sympy,Titan-C/sympy,abhiii5459/sympy,saurabhjn76/sympy,shipci/sympy,wanglongqi/sympy,jamesblunt/sympy,moble/sympy,Gadal/sympy,farhaanbukhsh/sympy,kumarkrishna/sympy,meghana1995/sympy,mafiya69/sympy,ahhda/sympy,drufat/sympy,mcdaniel67/sympy,mafiya69/sympy,grevutiu-gabriel/sympy,atreyv/sympy,atreyv/sympy,sahmed95/sympy,rahuldan/sympy,atsao72/sympy,Vishluck/sympy,ChristinaZografou/sympy,diofant/diofant,postvakje/sympy,Sumith1896/sympy,Titan-C/sympy,debugger22/sympy,cccfran/sympy,dqnykamp/sympy,kevalds51/sympy,souravsingh/sympy,ga7g08/sympy,iamutkarshtiwari/sympy,pandeyadarsh/sympy,cccfran/sympy,chaffra/sympy,beni55/sympy,garvitr/sympy,Designist/sympy,sunny94/temp,oliverlee/sympy,MridulS/sympy,jaimahajan1997/sympy,Sumith1896/sympy,grevutiu-gabriel/sympy,kaichogami/sympy,cswiercz/sympy,sampadsaha5/sympy,maniteja123/sympy,amitjamadagni/sympy,wanglongqi/sympy,skidzo/sympy,sunny94/temp,AunShiLord/sympy,pandeyadarsh/sympy,postvakje/sympy,hargup/sympy,saurabhjn76/sympy,toolforger/sympy,farhaanbukhsh/sympy,meghana1995/sympy,abhiii5459/sympy,lindsayad/sympy,sampadsaha5/sympy,jerli/sympy,kmacinnis/sympy,Curious72/sympy,hrashk/sympy,iamutkarshtiwari/sympy,lidavidm/sympy,VaibhavAgarwalVA/sympy,Davidjohnwilson/sympy,kaichogami/sympy,liangjiaxing/sympy,Shaswat27/sympy,hargup/sympy,Designist/sympy,liangjiaxing/sympy,toolforger/sympy,amitjamadagni/sympy,mcdaniel67/sympy,aktech/sympy,mcdaniel67/sympy,yashsharan/sympy,chaffra/sympy,Davidjohnwilson/sympy,ChristinaZografou/sympy,hrashk/sympy,asm666/sympy,moble/sympy