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This PR fixes `select` when given an empty list; it used to return `null` when given an empty list. I also cleaned up other `select` tests while I was in the area. ### Before: ``` > [] | select a | to nuon null ``` ### After: ``` > [] | select a | to nuon [] ``` It looks like the previous behaviour was accidentally introduced by [this PR](https://github.com/nushell/nushell/pull/7639).
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.