如何在puppet中迭代嵌套的字典？

$nested_dict = {
  'key1' => {
    'nested_key1' => 'value1',
    'nested_key2' => 'value2',
  },
  'key2' => {
    'nested_key3' => 'value3',
    'nested_key4' => 'value4',
  },
}

$nested_dict.each |$key, $value| {
  notice("Key: ${key}, Value: ${value}")
}

$nested_dict = {
  'key1' => {
    'nested_key1' => 'value1',
    'nested_key2' => 'value2',
  },
  'key2' => {
    'nested_key3' => 'value3',
    'nested_key4' => 'value4',
  },
}

$nested_dict.each_pair |$key, $value| {
  notice("Key: ${key}, Value: ${value}")
}