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C compression library that, per the interview, was translated into Lean by AI so that it passes the original test suite and satisfies a proved compress-then-decompress round-trip property.
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Laravel apps caching whole pages in Redis can store a 1.47MB response in 169KB by turning on zstd in phpredis, a dev.to benchmark found. Every cache hit moves the full value from Redis to PHP, so the saving applies to each read as well as to memory.
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An interview with Lean's founder says an AI translated C zlib into Lean and proved compress-then-decompress round-trips in about a week. The remaining work is optimization without breaking the proof.
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An auditor of abandoned crates.io packages rewrote crc32 from the zlib source, added slicing-by-16 and Python bindings, and shipped the result as crc32-v2. Projects that list crc32 still compile the 2015 code.
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One developer's APNG test set inflated by up to 2.41x when adaptive per-scanline filtering was switched on. The spec's rule scores byte magnitude; DEFLATE charges for repetition.
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You do not need a vendor's source tree to inventory what is running inside a shipped device. You do need to know that a version match is a lead, and that both known failure modes inflate the hit list.
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A 5-million-row file, opened byte by byte, puts the credit where it belongs: column locality, neighbour-dependent encoding, and metadata you can skip.
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