v0.8.2

Fix: List Attribute string vs int (#65)

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## Summary by CodeRabbit

* **Refactor**
* Code formatting and structure cleaned up for consistency and
maintainability.
* **Bug Fixes / Behavior**
* Improved value parsing and validation: parsing now short-circuits for
empty or string-keyed value lists and validates options more
predictably.
* **Tests**
* Added unit tests covering parsing and validation for string- and
numeric-keyed attribute configurations.

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