v3.4.0

What's Changed

❗ Up to ~2x faster DAG-CBOR encode and decode!

This release is all about throughput. The numbers below come from pytest-benchmark on an Apple M1 / CPython 3.14, comparing v3.3.2 → v3.4.0 head-to-head.

⚡ Decode (DAG-CBOR)

Fixture	v3.3.2	v3.4.0	Speedup
github	138 µs	70 µs	1.96x (+96%)
twitter	1.44 ms	0.80 ms	1.81x (+81%)
citm_catalog	2.87 ms	1.81 ms	1.59x (+59%)
canada	5.49 ms	4.77 ms	1.15x (+15%)

⚡ Encode (DAG-CBOR)

Fixture	v3.3.2	v3.4.0	Speedup
canada	2.31 ms	1.17 ms	1.98x (+98%)
citm_catalog	2.25 ms	1.26 ms	1.79x (+79%)
twitter	902 µs	635 µs	1.42x (+42%)
github	75.4 µs	69.7 µs	1.08x (+8%)

🔧 Optimizations

• Optimize DAG-CBOR encode/decode and CAR block parsing by @MarshalX in #104
• Optimize DAG-CBOR string decode with an ASCII fast path by @MarshalX in #105
• Optimize DAG-CBOR map decode with a key-intern cache and KnownHash insert by @MarshalX in #106
• Optimize int encode with a direct PyLong digit read by @MarshalX in #107

🧰 Toolchain & Build

• Bump to Rust 1.95 and PyO3 0.28 by @MarshalX in #102
• Drop the macos-13 PGO runner; cross-compile x86_64 macOS wheels from arm64 by @MarshalX in #108
• Bump CI actions (Node 24) and pytest-codspeed v5 by @MarshalX in #103

📊 Benchmarks & Docs

• Add a head-to-head benchmark against other Python DAG-CBOR libs by @MarshalX in #109
• Update README and copyright years by @MarshalX in #110

Deserialization v3.3.2 → v3.4.0

Serialization v3.3.2 → v3.4.0

🏎️ Old-style performance comparison. Before (v3.3.2) VS After (v3.4.0):

Full Changelog: v3.3.2...v3.4.0