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I tried with a few simple examples, numerous errors are reported (basically everything is reported as an error and underlined). If I paste the same json into a .js file it seems to work OK.
These error reports were probably caused by the first commit of error recovery support. The problem seems to be already fixed, I have tried several json files and all of them have been parsed correctly.
JSON works fine for me. Verified.
move back to consistent state RESOLVED/FIXED