first version

test/config.json

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+{
+  "strKey": "string value",
+  "intKey": 1000,
+  "boolKey": true,
+  "floatKey": 1.2345,
+  "strArr": ["arr1"],
+  "objKey": {
+    "name": "name"
+  },
+  "arrObj": [{"key": "val"}]
+}

test/config.toml

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+strKey = "string value"
+intKey = 1000
+boolKey = true
+floatKey = 1.2345
+strArr = [
+  "arr1"
+]
+
+[objKey]
+name = "name"
+
+[[arrObj]]
+key = "val"

test/config.yaml

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+strKey: string value
+intKey: 1000
+boolKey: true
+floatKey: 1.2345
+strArr:
+  - arr1
+objKey:
+    name: name
+arrObj:
+  - key: val
+