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# Description We previously simply searched all commands in the working set. As our deprecated/removed subcommands are documented by stub commands that don't do anything apart from providing a message, they were still included. With this change we check the `Signature.category` to not be `Category::Deprecated`. ## Note on performance Making this change will exercise `Command.signature()` more frequently! As the rust-implemented commands include their builders here this probably will cause a number of extra allocations. There is actually no valid reason why the commands should construct a new `Signature` for each call to `Command.signature()`. This will introduce some overhead to generate the completions for commands. # User-Facing Changes Example: `str <TAB>` 
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.