support escaped chars (doesn't processed in actson)

[cpunion]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.37500% with 102 lines in your changes missing coverage. Please review.

Project coverage is 75.06%. Comparing base (67b5d31) to head (656c6f6).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/json.rs	71.71%	52 Missing and 19 partials ⚠️
src/params.rs	95.62%	5 Missing and 26 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   75.07%   75.06%   -0.02%     
==========================================
  Files           7        7              
  Lines        1878     1969      +91     
  Branches     1878     1969      +91     
==========================================
+ Hits         1410     1478      +68     
- Misses        353      374      +21     
- Partials      115      117       +2     

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