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751c114126
In short, the fix I submitted looked at the union ofproperties, but it really should have looked at the intersection. Two sytlistic notes. I couldn't find the best way to get the unique strings of an array like `[...new Set()]` would, so I created a small helper function, but didn't put it in a great place. Also, before the second concatenated array of discriminators at least matched the first in complexity, but now it's much worse. I don't think that section is particularly easy to read, but I also don't see a significantly reusable part. fixes #41759