speedup string parsing by copying serde a little

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #58 will improve performances by 49.96%

_{Comparing string-parsing-speedup (e5112ef) with main (0b21d4a)}

Summary

⚡ 2 improvements ✅ 43 untouched benchmarks

🆕 6 new benchmarks

Benchmarks breakdown

	Benchmark	main	string-parsing-speedup	Change
⚡	x100_jiter_value	6.8 µs	5.5 µs	+23.94%
🆕	sentence_serde_value	N/A	24.4 µs	N/A
🆕	sentence_jiter_iter	N/A	18.3 µs	N/A
⚡	x100_jiter_iter	4 µs	2.7 µs	+49.96%
🆕	python_parse_x100_not_cached	N/A	9.7 µs	N/A
🆕	python_parse_x100	N/A	10 µs	N/A
🆕	x100_serde_iter	N/A	5.9 µs	N/A
🆕	sentence_jiter_value	N/A	20.4 µs	N/A

[codecov[bot]]

Codecov Report

Merging #58 (e5112ef) into main (0b21d4a) will increase coverage by 0.22%. The diff coverage is 98.38%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #58 +/- ## ========================================== + Coverage 95.12% 95.35% +0.22% ========================================== Files 8 8 Lines 1067 1097 +30 ========================================== + Hits 1015 1046 +31 + Misses 52 51 -1 ``` | [Files](https://app.codecov.io/gh/pydantic/jiter/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic) | Coverage Δ | | |---|---|---| | [src/string\_decoder.rs](https://app.codecov.io/gh/pydantic/jiter/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic#diff-c3JjL3N0cmluZ19kZWNvZGVyLnJz) | `94.63% <98.38%> (+2.19%)` | :arrow_up: | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/pydantic/jiter/pull/58?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/pydantic/jiter/pull/58?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic). Last update [0b21d4a...e5112ef](https://app.codecov.io/gh/pydantic/jiter/pull/58?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydantic).