It's slightly faster according to [Zulip](https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/JSON.20serialization.20perf/near/447201887), but it's currently [missing](https://github.com/simd-lite/simd-json/issues/270) the equivalent of `preserve_order`, which we use to dump the config schema. We could use both, but I'm not sure it's worth the hassle.
