in src/Amazon.Extensions.Configuration.SystemsManager/Internal/JsonConfigurationParser.cs [120:130]
private void VisitPrimitive(JValue data)
{
var key = _currentPath;
if (_data.ContainsKey(key))
{
throw new FormatException($"A duplicate key '{key}' was found.");
}
_data[key] = data.Value == null ? null : data.ToString(CultureInfo.InvariantCulture);
}