Fix inconsistent behavior when matching functions by using '==' rather than 'is' comparison.
Fix inconsistent behavior when matching functions by using '==' rather than 'is' comparison.

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