Tweak union type inference to restore previous behavior
Tweak union type inference to restore previous behavior

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