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e9abbc1a02
This feature causes nothing but problems and is frequently broken. The only optimization it was enabling were SIMD optimizations for transcoding. In particular, for UTF-16 transcoding. This is performed by the [`encoding_rs`](https://github.com/hsivonen/encoding_rs) crate, which specifically uses unstable portable SIMD APIs instead of the stable non-portable SIMD APIs. SIMD optimizations that apply to search have long been making use of stable APIs, and are automatically enabled when your target supports them. This is, IMO, the correct user experience and one that `encoding_rs` refuses to support. I'm done dealing with it, so transcoding will only use scalar code until the SIMD optimizations in `encoding_rs` work on stable. (This doesn't mean that `encoding_rs` has to change. This could also be fixed by stabilizing `std::simd`.) Fixes #2748