Fix to_json function

[adriangb]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #577 fix-json-ser (88dccb2) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 112 untouched benchmarks

🆕 0 new benchmarks
⁉️ 0 dropped benchmarks

[codecov-commenter]

Codecov Report

Merging #577 (88dccb2) into main (119b265) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #577      +/-   ##
==========================================
+ Coverage   94.17%   94.19%   +0.01%     
==========================================
  Files          95       95              
  Lines       12970    12995      +25     
  Branches       24       24              
==========================================
+ Hits        12214    12240      +26     
+ Misses        750      749       -1     
  Partials        6        6              

Impacted Files	Coverage Δ
src/serializers/extra.rs	99.11% <ø> (-0.02%)	⬇️
src/serializers/infer.rs	96.71% <100.00%> (+0.01%)	⬆️
src/serializers/mod.rs	99.02% <100.00%> (+0.14%)	⬆️

... and 1 file with indirect coverage changes

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