use Cow in JsonValue

[samuelcolvin]

No description provided.

[codecov]

Codecov Report

Merging #63 (9364d47) into main (625b202) will increase coverage by 0.25%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   95.49%   95.74%   +0.25%     
==========================================
  Files           8        8              
  Lines        1110     1199      +89     
==========================================
+ Hits         1060     1148      +88     
- Misses         50       51       +1     

Files	Coverage Δ
src/jiter.rs	99.50% <100.00%> (+0.03%)	⬆️
src/lazy_index_map.rs	97.97% <100.00%> (+0.25%)	⬆️
src/string_decoder.rs	94.15% <100.00%> (-0.48%)	⬇️
src/value.rs	100.00% <100.00%> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 625b202...9364d47. Read the comment docs.

[codspeed-hq]

CodSpeed Performance Report

Merging #63 will improve performances by ×2.4

_{Comparing string-cow (9364d47) with main (625b202)}

Summary

⚡ 5 improvements
✅ 49 untouched benchmarks

🆕 2 new benchmarks

Benchmarks breakdown

	Benchmark	main	string-cow	Change
⚡	medium_response_jiter_value	209.5 µs	152.4 µs	+37.44%
🆕	medium_response_jiter_value_owned	N/A	208.6 µs	N/A
⚡	pass1_jiter_value	161.1 µs	126.9 µs	+26.96%
⚡	string_array_jiter_value	167.3 µs	70.7 µs	×2.4
🆕	string_array_jiter_value_owned	N/A	165.9 µs	N/A
⚡	true_object_jiter_value	209.2 µs	112.9 µs	+85.38%
⚡	x100_jiter_value	4.9 µs	3.4 µs	+45.26%

[davidhewitt]

Works as intended 🚀