Why does a QJsonArray appear to have an additional array-like depth? - json

Question

I have some JSON data that looks something like this:
{
"high_scores": [
{
"name": "Homer",
"score": 1601
},
{
"name": "Bart",
"score": 1492
}
],
"an_item": "Simpson",
"another_item": 20
}
which I have loaded into a QJsonObject. Accessing an_item and another_item both work properly. The issue is when I try to access the high_scores array.
I am able to get a QJsonArray object with this code
const QJsonArray array{obj["high_scores"]};
I have also tried
const QJsonArray array{obj["high_scores"].toArray()};
When I try to access the object elements within array things start going south and I start getting empty objects.
Looking in the debugger, I'm seeing an additional array-like object with array that appears to contain the actual data:
array <1 items>
[0] <2 items> <--This seems wrong to me
[0] <2 items>
[1] <2 items>
If I write something like
QJsonObject elem{array[0][ndx].toObject()}; // Note the extra [0]
then I can get to the ndxth element of the array, but that just doesn't seem right.
Am I missing something obvious?

Answer 1

OK, this appears to be an issue with the code generated by
const QJsonArray array{obj["high_scores"].toArray()}; // new style initialization syntax
This code generated a call to a QJsonValue constructor taking a QJsonArray reference. This call initializes the QJsonValue's value to a QCborArray, which appears to be the cause of the extra "array-like" object I was seeing in the debugger.
By going back in time a bit and using the old ways of initialization
const QJsonArray array = obj["high_scores"].toArray(); // old style initialization syntax
generates the code I expected and solves the problem.