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This PR fixes an issue with `explore` where you can "drill down" into the same value forever. For example: 1. Run `ls | explore` 2. Press Enter to enter cursor mode 3. Press Enter again to open the selected string in a new layer 4. Press Enter again to open that string in a new layer 5. Press Enter again to open that string in a new layer 6. Repeat and eventually you have a bajillion layers open with the same string IMO it only makes sense to "drill down" into lists and records. In a separate commit I also did a little refactoring, cleaning up naming and comments.
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.