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**Grade: 8**
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### Bugs
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- There are no explicit bugs in the given code. However, it is important to ensure data integrity between `CodingData` and `UnreadNumbers`.
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### Optimizations
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- The `CodingData` structure could implement a custom initializer that ensures that `all` in `UnreadNumbers` is equal to the sum of other properties if that is a business requirement.
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- Consider renaming the `subs` property in `CodingData` to `subscriptions` to keep consistency across structures.
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### Good points
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- The code is well-structured, with appropriately named components.
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- The use of `Decodable`, `Hashable`, and `Sendable` protocols enhances the versatility and functionality of the `UnreadNumbers` struct.
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- Consistent use of access control modifiers (`public`) for properties and initializers where necessary.
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- Efficient transformation from `CodingData` to `UnreadNumbers` using the `decoded` computed property.
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### Summary
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The code snippet provides a well-crafted extension of a `NotificationFeed` class to manage unread notifications efficiently. It is well-structured, establishing clear separation of concerns particularly through the use of Codable structures for decoding and ensuring compatibility with concurrency through the `Sendable` protocol. Minor consistency improvements with property naming and initializing could enhance the code's robustness and readability further.
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### Open source alternatives
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- [Rocket.Chat](https://github.com/RocketChat/Rocket.Chat) provides notification features that can be extended or used as a reference.
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- [Mattermost](https://github.com/mattermost/mattermost-server) also deals with notifications and could provide additional perspective on handling unread notification counts effectively. |