Improve performance of duplicate check (#23516)
Improve performance of duplicate check (#23516)


SaschaNaz/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,Microsoft/TypeScript,kpreisser/TypeScript,donaldpipowitch/TypeScript,SaschaNaz/TypeScript,donaldpipowitch/TypeScript,alexeagle/TypeScript,nojvek/TypeScript,minestarks/TypeScript,kitsonk/TypeScript,microsoft/TypeScript,minestarks/TypeScript,weswigham/TypeScript,nojvek/TypeScript,RyanCavanaugh/TypeScript,Microsoft/TypeScript,basarat/TypeScript,microsoft/TypeScript,basarat/TypeScript,minestarks/TypeScript,SaschaNaz/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,basarat/TypeScript,kitsonk/TypeScript,donaldpipowitch/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,kpreisser/TypeScript,donaldpipowitch/TypeScript,RyanCavanaugh/TypeScript,nojvek/TypeScript,weswigham/TypeScript,microsoft/TypeScript,RyanCavanaugh/TypeScript,alexeagle/TypeScript,basarat/TypeScript