v3.5.0

What's Changed

🐍 Python 3.15 and free-threaded Python 3.14t / 3.15t wheels

⚡ Up to 2x faster DAG-CBOR encode, up to 10% faster decode

Encode	v3.4.1	v3.5.0	Speedup
citm_catalog	1.04 ms	0.52 ms	2.01x (+101%)
github	0.05 ms	0.03 ms	1.78x (+78%)
twitter	0.47 ms	0.27 ms	1.74x (+74%)
canada	0.83 ms	0.64 ms	1.29x (+29%)

Decode	v3.4.1	v3.5.0	Speedup
canada	4.22 ms	3.82 ms	1.10x (+10%)
torture_cids	63.5 ms	59.0 ms	1.08x (+8%)
github	0.07 ms	0.06 ms	1.06x (+6%)
atproto_repo.car	65.0 ms	61.8 ms	1.05x (+5%)
twitter	0.77 ms	0.75 ms	1.02x (+2%)
citm_catalog	1.71 ms	1.71 ms	1.00x (+0%)

❗ Behavior changes: -0.0 is now rejected on decode and encoded as 0.0, as the DAG-CBOR spec requires; encoding deeply nested data raises RecursionError instead of crashing; malformed CAR header types raise ValueError.

• Add Python 3.15 support; bump PyO3 0.29 and deps, adopt Ruff 0.17 default rules by @MarshalX in #129
• Add free-threaded wheels for Python 3.14t and 3.15t by @MarshalX in #130
• Ship py.typed so type checkers pick up the bundled stubs by @MarshalX
• Optimize DAG-CBOR encode by reusing a thread-local buffer and validating CIDs without Multihash construction by @MarshalX in #116
• Optimize DAG-CBOR decode by reading each CBOR header once instead of re-decoding it per value by @MarshalX in #118
• Optimize DAG-CBOR decode by reading multi-byte header arguments at a fixed width by @MarshalX in #121
• Optimize DAG-CBOR encode by sorting map entries on a pooled stack and borrowing container items by @MarshalX in #122
• Optimize DAG-CBOR encode/decode by dispatching leaf values inline and recursing only for containers by @MarshalX in #123
• Forbid negative zero in DAG-CBOR: reject -0.0 on decode and encode it as 0.0 by @MarshalX in #126
• Raise RecursionError instead of overflowing the stack when encoding deeply nested DAG-CBOR by @MarshalX in #128
• Document raised exceptions and normalize CAR header type errors to ValueError by @MarshalX in #127
• Restructure single-file lib.rs into per-domain modules by @MarshalX in #114
• Replace _PyDict_SetItem_KnownHash with public PyDict_SetItem by @MarshalX in #124
• Fix decode error handling: PyList leak, unbounded preallocation, and swallowed errors in decode_dag_cbor_multi by @MarshalX in #117
• Fix list and bytearray races under free-threading by @MarshalX in #130
• Fix Windows build after PyO3 0.29 by @MarshalX in #131
• Fix encode_multibase docs: 'u' is base64url, not base58btc by @MarshalX in #132

Full Changelog: v3.4.1...v3.5.0