Expert knowledge for xxHash, an extremely fast non-cryptographic hash algorithm. Use when implementing checksums, hash tables, bloom filters, content deduplication, cache keys, or data integrity verification. Covers XXH32, XXH64, XXH3 variants with language-specific guidance for Rust (xxhash-rust, twox-hash), TypeScript (hash-wasm, xxhash-wasm, @node-rs/xxhash), Python, Go, and Java.