[akasakariko]

Object properties such as foo.bar-baz become Rust fields such as foo_bar_baz without a Serde rename, causing serialization to emit the wrong JSON key and deserialization to reject the original schema key

Always add Serde renames in the Rust and Rust Sym object templates while retaining the existing Rust field names, including fields whose names already match the schema

Extend the existing object test to cover dots, hyphens, uppercase names, nested objects, arrays, union properties, and an unchanged snake_case property

Bug 1929903: https://bugzilla.mozilla.org/show_bug.cgi?id=1929903

Firefox’s separate generator patch: https://phabricator.services.mozilla.com/D338979

Validation on afa0dd058c1d7009670cc0fd5afad545dba6b5f6, after merging upstream main at dc9ff80a8b1b9fb67fe8d7d8a57f3faa6a7c842c:

• Rust and Rust Sym tests: 12 passed
• Default pytest suite: 312 passed, 25 skipped
• Ruff check and format, yamllint, mypy, license check, and git diff --check: passed
• Standalone Serde checks using structs generated by the Rust, Rust Sym, and Firefox template macros: 12 passed, covering original keys, round trips, rejection of normalized keys, and omission behavior
• GitHub CI for the current commit: all 12 jobs passed, including Python 3.9–3.14, minimum dependency versions, docs, lint, license checks, and security analysis
• All seven CI Python configurations ran make test-full and reported 337 passed; the documentation build passed with 9 warnings
• The optional full suite was not rerun locally; full SDK integration and browser end-to-end tests have not been run

Pull Request checklist

• Quality: Local tests and all GitHub CI jobs passed for the current commit
  • Existing deprecation warnings remain
• Tests: The existing object test covers renamed and unchanged property names in both Rust generators
• Changelog: Added an entry to CHANGELOG.md; Rust field names remain unchanged