v6.0.0 - Native Rust Extension for 29x Faster Performance

json2xml v6.0.0 🚀

Major Release: Native Rust Extension for 29x Faster Performance

This release introduces an optional native Rust extension built with PyO3 that provides approximately 29x faster JSON to XML conversion compared to pure Python.

✨ Highlights

• Optional Rust acceleration - Install json2xml-rs for blazing fast performance
• Zero breaking changes - Pure Python version works exactly as before
• Automatic backend selection - Use dicttoxml_fast module for auto-detection
• Cross-platform wheels - Pre-built for Linux, macOS (Intel + Apple Silicon), Windows

📊 Performance Benchmarks

JSON Size	Pure Python	With Rust	Speedup
Small (47 bytes)	6.85 µs	0.21 µs	33x
Medium (3.2KB)	160 µs	5.6 µs	28x
Large (32KB)	1.59 ms	53 µs	30x
Very Large (323KB)	16.4 ms	569 µs	29x

📦 Installation

# Pure Python (always works)
pip install json2xml

# With Rust acceleration (optional, recommended)
pip install json2xml json2xml-rs

🔧 Usage

# Option 1: Auto-selecting wrapper (recommended)
from json2xml.dicttoxml_fast import dicttoxml
xml = dicttoxml({"name": "John", "age": 30})

# Option 2: Direct Rust import (fastest, requires json2xml-rs)
from json2xml_rs import dicttoxml
xml = dicttoxml({"name": "John", "age": 30})

# Option 3: Pure Python (always available)
from json2xml.dicttoxml import dicttoxml
xml = dicttoxml({"name": "John", "age": 30})

📁 New Files

• rust/ - PyO3 Rust extension source code
• json2xml/dicttoxml_fast.py - Auto-selecting wrapper module
• tests/test_rust_dicttoxml.py - 84 comprehensive tests
• benchmark_rust.py - Performance comparison script
• .github/workflows/build-rust-wheels.yml - CI for building wheels
• .github/workflows/rust-ci.yml - CI for Rust code quality

⚠️ Rust Extension Limitations

The Rust implementation does not yet support:

• ids parameter
• item_func parameter
• xml_namespaces parameter
• xpath_format parameter
• @attrs, @val, @flat special dict keys

For these features, use the pure Python implementation or dicttoxml_fast (which auto-falls back).

🔗 Related Projects

• Go version: github.com/vinitkumar/json2xml-go
• Zig version: github.com/nicholasgriffintn/json2xml-zig

📝 Full Changelog

See HISTORY.rst for complete changelog.

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Thank you to all contributors! 🙏