json2xml-rs 0.4.2
Immutable
release. Only release title and notes can be modified.
Performance
Flamegraph-guided XML escaping now uses a bounded sparse memchr fast path and switches to monotonic SIMD/word scanners after four matches. This keeps dense escape input linear while accelerating normal serializer payloads.
On the deterministic 5,000-record CPython 3.15.0b3 workload:
| Metric | 0.4.1 | 0.4.2 | Change |
|---|---|---|---|
| Median conversion | 6.007 ms | 5.632 ms | 6.23% lower |
| Mean conversion | 6.013 ms | 5.643 ms | 6.14% lower |
| Escape writer exclusive samples | 14.31% | 7.97% | 44.3% lower share |
| Output size | 4,093,244 bytes | 4,093,244 bytes | identical |
The 16 KiB streaming output buffer remains unchanged: a 4–128 KiB sweep plateaued across 16–64 KiB, and an ABBA confirmation measured 16 KiB about 0.8% faster than 32 KiB without extra per-call memory.
Compatibility and validation
- preserved all five XML substitutions and UTF-8 boundaries
- added a dense-input regression test for linear scanning
- 48 Rust unit tests passed
- 421 Python tests passed with exactly 100% statement coverage
- release wheels were installed and tested across Linux, macOS, and Windows before publication
- PyPI contains 34 non-yanked files, including CPython 3.10–3.14 wheels for both macOS architectures and a CPython 3.15 beta Linux wheel
