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1954a0a1a1
This reverts the relevant bits from #21746 so that style and dependencies can build with stable. This is important because: * `selectors` is a published crate. * Gecko compiles with stable (more or less). I reviewed that PR under the assumption that the union feature was stable, since untagged unions are stable since 1.19, but turns out that smallvec uses non-Copy types in unions, which are still unstable. This leaves the union feature used on Servo, so that it gets testing, taking advantage of features being additive.