I think it's rare for them to be explicilty stated, but common for them to be present in practice. I-JSON is just an explicit list of these common implicit limi

I think it's rare for them to be explicilty stated, but common for them to be present in practice. I-JSON is just an explicit list of these common implicit limits. For any given tool/service that describes itself as accepting JSON I would expect I-JSON documents to be more likely to work as expected than non-I-JSON.