Add support for JSON5 as extension of json.js. #4259
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Addition of JSON5 handling to json.js.
Resolves #4260
Changes
In addition to adding 'json5' to json.js, I noticed a suspicious looking regex in javascript.js. I can make this fix and all tests still pass, so I think including this change is a good idea. The suspicious regex, at line 460, is this:
It seems highly doubtful this was meant to be the range from uppercase A to lowercase z, which isn't just letters, but the punctuation " [ \ ] _ ` " as well.
Checklist
CHANGES.mdSUPPORTED_LANGUAGES.md