support float_mode='decimal'

[samuelcolvin]

fix #108

[samuelcolvin]

this should probably have been a separate RP, but I was flying at the time.

The big change here is to benchmark with all the examples from rust benchmarks, which in turn means the PGO has more run data to work with.

[codspeed-hq]

CodSpeed Performance Report

Merging #116 will degrade performances by 10.62%

_{Comparing return-decimal (b74e534) with main (b613634)}

Summary

❌ 1 regressions
✅ 72 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	return-decimal	Change
❌	true_array_jiter_skip	4.5 µs	5 µs	-10.62%

[codecov]

Codecov Report

Attention: Patch coverage is 89.58333% with 5 lines in your changes missing coverage. Please review.

Files	Patch %	Lines
crates/jiter/src/py_lossless_float.rs	76.92%	3 Missing ⚠️
crates/jiter/src/errors.rs	0.00%	1 Missing ⚠️
crates/jiter/src/python.rs	96.77%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[davidhewitt]

LGTM 👍