url: URLPattern.exec() does not preserve capture group declaration order

Version

latest main branch

Platform

7.1.4-arch1-1

Subsystem

url

What steps will reproduce the bug?

  const assert = require('node:assert');
  const { URLPattern } = require('node:url');

  const pattern = new URLPattern({
    pathname: '/:one/:two/:three',
  });

  const result = pattern.exec('https://example.com/a/b/c');

  console.log(Object.entries(result.pathname.groups));

How often does it reproduce? Is there a required condition?

Every

What is the expected behavior? Why is that the expected behavior?

  [
    ['one', 'a'],
    ['two', 'b'],
    ['three', 'c'],
  ]

URLPattern.exec() may expose named capture groups in an order different from their declaration order.

The captured values remain accessible by name, but the incorrect property insertion order is observable through Object.keys(), Object.values(), Object.entries(), object spread, and JSON serialization.

What do you see instead?

  [
    ['three', 'c'],
    ['two', 'b'],
    ['one', 'a'],
  ]

Additional information

No response

Start by running the reproduction with node:url's URLPattern.exec() and inspect the resulting pathname.groups object. Trace the URLPattern implementation and its tests to identify how named groups are inserted; done means the groups appear in declaration order while remaining accessible by name, with regression coverage for the example.