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* Introduce --strictOptionalProperties compiler switch * Accept new baselines * Removing missingType when printing back optional properties * Accept new baselines * Fix linting issue * Use getNonMissingTypeOfSymbol in getTypeOfSymbolAtLocation * Properly elaborate errors involving optional properties * Accept new baselines * Properly check optional properties in tuple types * Accept new baselines * Add missing tuple type check * More permissive check of strict optional properties and index signatures * Add tests * Fix lint issues * Accept new baselines