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Initial draft that works for union types First draft of PR ready code with tests Revert changed line for testing Add exhaustiveness checking and move narrowByTypeOfWitnesses Try caching mechanism Comment out exhaustiveness checking to find perf regression Re-enable exhaustiveness checking for typeof switches Check if changes to narrowByTypeOfWitnesses fix perf alone. Improve switch narrowing: + Take into account repeated clauses in the switch. + Handle unions of constrained type parameters. Add more tests Comments Revert back to if-like behaviour Remove redundant checks and simplify exhaustiveness checks Change comment for narrowBySwitchOnTypeOf Reduce implied type with getAssignmentReducedType Remove any annotations