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# Description Clarified `random chars` help/doc: * Default string length in absence of a `--length` arg is 25 * Characters are *"uniformly distributed over ASCII letters and numbers: a-z, A-Z and 0-9"* (copied from the [`rand` crate doc](https://docs.rs/rand/latest/rand/distributions/struct.Alphanumeric.html). # User-Facing Changes Help/Doc only
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.