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# Description Get rid of two parallel `Vec`s in `StateDelta` and `EngineState`, that also duplicated span information. Use a struct with documenting fields. Also use `Arc<str>` and `Arc<[u8]>` for the allocations as they are never modified and cloned often (see #12229 for the first improvement). This also makes the representation more compact as no capacity is necessary. # User-Facing Changes API breakage on `EngineState`/`StateWorkingSet`/`StateDelta` that should not really affect plugin authors.
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.