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* More precise property-overwritten-by-spread errors Trying to do this check in getSpreadType just doesn't have enough information, so I moved it to checkObjectLiteral, which is a better place for issuing errors anyway. Unfortunately, the approach is kind of expensive in that it 1. creates a new map for each property and 2. iterates over all properties of the spread type, even if it's a union. I have some ideas to improve (1) that might work out. I'm not sure how bad (2) is since we're going to iterate over all properties of all constituents of a union. Fixes #36779 * another test and rename