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698dd600f2
Selectors like `:is(.valid, &!?!?!invalid)` need to keep the invalid part around, even though it will never match, for a couple of reasons: - Serialization needs to include them - For nesting, we care if a `&` appeared anywhere in the selector, even in an invalid part. So this patch introduces an `Invalid` simple selector type, which simply holds its original ComponentValues. We search through these looking for `&`, and we dump them out directly when asked to serialize.