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I've also seen using "__" as a key for comments. I think it's better because it doesn't need to be escaped.
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There _is_ a json variant with comments, so that’s what you’ve seen. Not all parsers support that though
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It's non-standard JSON, so you can probably just assume most patsers don't support any given commented parser.

At least XML permitted comments, fhe shift to JSON on everything almost makes me nostalgic.

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When you get too nostalgic just think back to XSD type system in Xquery. That should cure the nostalgia real fast.
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Are you denying what I've seen with my own eyes? I am saying it was an object like this:

{ "//":"make sure these are divisible by 8", "width": 640, "height": 480 }

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Oooh, I misunderstood. I thought you were seeing this: https://jsonc.org/
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Not the person you’re replying to but you were clear in what you were describing.

It seems like they were thinking of some json parsers that’ll ignore just straight up anything after // before a new line in JSON (looking at you visual studio). So a .NET dev who has never touched anything but Visual Studio may make comments in the appsettings.json for a .NET project and it made all my command line parsers throw errors. Thanks Microsoft.

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It's not terrible as far as I know, and it's less ambiguous than putting a "comment" key. I like it!
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