preserveOrder with attributesGroupName option creates extra hirarchy

[floratmin]

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• Have you included sample input, output, error, and expected output?
• Have you checked if you are using correct configuration?
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• Have you checked the docs for helpful APIs and examples?

Description

When I use both options together, then the attributeGroup gets wrapped by an extra object with the key specified by attributesGroupName.

Code

const parser = new  XMLParser({
    attributesGroupName: ':@',
    preserveOrder: true,
    ignoreAttributes: false,
});
const parsed = parser.parse('<root xmlns:ex="http://example.com"><p test="foo"></p></root>');
console.log(parsed);

Output

[
  {
    root: [
      p: [],
      ':@': {
        ':@': {
          '@_test': 'foo',
        },
      },
    ],
    ':@': {
      ':@': {
        '@_xmlns:ex': 'http://example.com',
      },
    },
  },
]

expected data

[
  {
    root: [
      p: [],
      ':@': {
        '@_test': 'foo',
      },
    ],
    ':@': {
      '@_xmlns:ex': 'http://example.com',
    },
  },
]

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