For CSS sanitization, I resisted the urge to parse CSS with regexused lightningcss library. It allows going through every token very efficiently. The documentation was horrible, but I managed to do it after a lot of tinkering. The list is smaller:
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MacBook Neo 桃粉色预售即告急，高管解释命名由来
The fix was surprisingly simple. With rkyv offering lots of flexibiliy here as the serialization framework. We could keep the in-memory struct interface and just change the serialized format which now chooses the best representation (dense vs. sparse) on a per-row basis.