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# Description Adds the ability to use `polars contains` as an expression: <img width="785" alt="Screenshot 2024-09-03 at 14 39 03" src="https://github.com/user-attachments/assets/35c0d4e5-6bef-4974-a31f-463c7203bd03"> # User-Facing Changes - `polars contains` can now be used with expressions
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.