Configuration file example:
```
config = 3
config_b.items = item1
config_b.items = item2
config_b.items.named_item = 123
config_c.root.a.b.c = 13
```
Expected output:
```
{
"config":3,
"config_b":{
"items":{
"0":"item1",
"1":"item2",
"named_item":123
}
},
"config_c":{
"root":{
"a":{
"c":13
}
}
}
}
```