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I'm banging my head against creating nested arrays in GCD, docs say it's possible but I'm unable to get it to work...

I would like to get json like this:
"Achievements": [
{ "Points": [ 1, 2] },
{ "Points": [ 2, 3 ] }
]

But what I'm getting with this setup is:
"Achievements": [
{
"Points": [ 2 ]
},
{
"Points": [ 1 ]
},
{
"Points": [ 3 ]
},
{
"Points": [ 2 ]
}
]