This piece of code:
{
"new": 2,
"Integer": {
"class": false,
"interface": "awd"
},
"a": [
{
"b": 2,
"f": false
},
{
"f": [
"f",
false,
{
"k": "awd",
"m": false
}
]
}
]
}
gave me this result:

My assumption it's because of loosely typed array in loosely typed array, but this is just an assumption.
This piece of code:
{ "new": 2, "Integer": { "class": false, "interface": "awd" }, "a": [ { "b": 2, "f": false }, { "f": [ "f", false, { "k": "awd", "m": false } ] } ] }gave me this result:

My assumption it's because of loosely typed array in loosely typed array, but this is just an assumption.