Remove type assertion in sum function (#22670)
Remove type assertion in sum function (#22670)


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