**8**

### Bugs
- None

### Optimizations
- None necessary; the code is already concise and efficient.

### Good points
- Use of `enum` with `Int` raw values simplifies direct comparisons and storage in certain types of collections.
- Conformance to `Hashable` and `Sendable` is a good practice for future compatibility and concurrency.
- Clear documentation comments describe each case, enhancing the understandability.
- The use of negative, zero, and positive values is intuitive for this domain context (voting logic).

### Summary
The code is well-structured, efficiently using Swift's `enum` to categorize vote states with associated integer values. The choice to adopt `Hashable` and `Sendable` suits modern Swift programming best practices, aiding in serialization and safe concurrency. There are no apparent bugs or necessary optimizations, and the documentation is clear and concise.

### Open source alternatives
- **Swift's `Result` Type**: Although more generic, it can be used for similar representations in voting systems.
- **Custom Implementations in Projects like Mastodon or Lemmy**: Often, custom voting systems can be seen in open-source frameworks of social media platforms, providing rich functionalities.