rmlint is unable to read a 50M json file it has produced after scanning a large number of files
$file large.json
large.json: UTF-8 Unicode text

see attached file,
large.tar.gz

Edit:
doing other tests with a 10M json file found that the json file was ISO-8859-1 encoded
converted it using
iconv -f ISO-8859-1 -t UTF-8//TRANSLIT rmlint.json -o rmlintutf8.json
and it worked

it seems that for some reason the resulting json file from rmlint is ISO-8859-1