[sean0407]

Fixes #1430

query-string@4.3.4 ignores arrayFormat: "comma" and serializes an array as repeated query parameters. The serializer now joins arrays when comma format is requested, so the fields remain in one parameter. The regression test covers fields: ["geometry", "name"].

Changed files:

• src/serialize.ts
• src/serialize.test.ts

Checks:

• npm run build — passed.
• jest --runInBand --runTestsByPath src/serialize.test.ts with the lockfile dependency query-string@7.1.3 — 12/12 passed.
• The comma-array regression test with query-string@4.3.4 — passed.
• ESLint on both changed files — passed.
• npm run lint — reports 11 Prettier errors in unchanged files under e2e/geocode and src/common.ts / src/geocode.

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