Fixed Basic.sort_key() to work with non-Basic args
Fixed Basic.sort_key() to work with non-Basic args

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