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Go 1.21 improved the performance of `crypto/sha256`. It's now similar to `minio/sha256-simd`, so we should just use the standard libs. https://go.dev/doc/go1.21#crypto/sha256 https://go-review.googlesource.com/c/go/+/408795 https://github.com/multiformats/go-multihash/pull/173