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# Description In this PR I replaced most of the raw usize IDs with [newtypes](https://doc.rust-lang.org/rust-by-example/generics/new_types.html). Some other IDs already started using new types and in this PR I did not want to touch them. To make the implementation less repetitive, I made use of a generic `Id<T>` with marker structs. If this lands I would try to move make other IDs also in this pattern. Also at some places I needed to use `cast`, I'm not sure if the type was incorrect and therefore casting not needed or if actually different ID types intermingle sometimes. # User-Facing Changes Probably few, if you got a `DeclId` via a function and placed it later again it will still work.
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.