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a11c41621b
* Improve checking of `in` operator
* Accept new baselines
* Add tests
* Delete old and accept new baselines
* Disallow right operand of type '{}'
* Accept new baselines
* Support number and symbol literals
* Add tests
* Disallow {} typed right operand only in strictNullChecks mode
* Accept new baselines
* Detect {} resulting from intersections
* Accept new baselines
* Don't attempt to reduce intersections with Record<K, unknown>
* Accept new baselines
* Return undefined instead of unknownSymbol from getGlobalRecordSymbol()