Configuration file example config config_b items item1 config_b items

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
         }
      }
   }
}
```