Different predicates should not have identical sort keys.
Different predicates should not have identical sort keys.

Before this commit:

    >>> Q.bounded.sort_key()
    ((5, 0, 'Predicate'), (0, ()), ((1, 0, 'Number'), (0, ()), (), 1), 1)
    >>> Q.bounded.sort_key() == Q.commutative.sort_key()
    True

After this commit:

    >>> Q.bounded.sort_key()
    ((5, 0, 'Predicate'), (1, ('bounded',)), ((1, 0, 'Number'), (0, ()), (), 1), 1)
    >>> Q.bounded.sort_key() == Q.commutative.sort_key()
    False

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