add compat mode for JSON

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Codecov Report

Attention: 79 lines in your changes are missing coverage. Please review.

Comparison is base (182f58c) 94.02% compared to head (ffa5f58) 94.03%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2219   +/-   ##
=======================================
  Coverage   94.02%   94.03%           
=======================================
  Files         327      327           
  Lines       65064    65156   +92     
=======================================
+ Hits        61178    61271   +93     
+ Misses       3886     3885    -1     

Files	Coverage Δ
src/core/searcher.rs	77.98% <ø> (ø)
src/schema/document/de.rs	72.82% <100.00%> (+1.63%)	⬆️
src/schema/document/se.rs	90.70% <100.00%> (+0.01%)	⬆️
src/schema/document/mod.rs	90.00% <75.00%> (+0.07%)	⬆️
src/schema/document/existing_type_impls.rs	23.14% <57.14%> (ø)
src/schema/document/owned_value.rs	89.47% <82.60%> (+0.03%)	⬆️
src/core/json_utils.rs	97.74% <73.80%> (-0.40%)	⬇️
src/fastfield/writer.rs	92.41% <77.00%> (-0.39%)	⬇️
src/schema/document/value.rs	53.20% <47.88%> (+24.23%)	⬆️

... and 2 files with indirect coverage changes

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