That is: due to JSON specification, you can safely use such characters, as U+2028 in any string. It is a unicode whitespace character. Not control or other special character.
This is a sample, but since we have at least one case of difference, it's well-enough to realize that answer is no
Image source & full description: timelessrepo
First, some precaution should be taken when using the term "JSON object":
If you want, "JSON object" can refer to the object that a JSON text represents. Even the JSON specification defines what "object" means:
An object is an unordered collection of zero or more name/value pairs
This is just an intent, as JSON itself is not a processing language: it does not parse text into objects.
Not all JSON texts represent objects (e.g. they can represent string or number literals), so speaking of "JSON object" does have some additional value: it would be short for "a JSON text that represents an object".
It's like saying "email notification". Email is a communication mechanism, and one particular email can represent a message to you. It might represent a notification of something, but does not have to be.
[1, , 2]);
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