There are a lot of json variations and I don't think it would be worthwhile to duplicate them all. But as a practical manner for lint, comments are pretty common in config files. It would be nice if ArcanistJSONLinter had an option to allow them.
Seems weird, primarily due to lack of standardization. Would // and # both work? Or only one of them? The decision winds up being kind of arbitrary.
Some crazier options could even include /* */, ;, --, etc.