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# Description While reviewing #10350 I noticed that a `HashSet<usize>` was used to deduplicate the incoming rows, which are then sorted after cloning to a separate `Vec`. This sounds like a candidate for a `BTreeSet` which guarantees the ordering. In the process I removed some dead code. - Use `BTreeSet` instead of `HashSet` - Remove dead `skip` logic - Use `BTreeSet` directly in `NthIterator` - Consume `BTreeSet` through `Peekable<IntoIter>`
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.