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# Description With #11386 we don't have any nushell-internal code directly accessing the `vals` field of `Record`, so let's make it private so everyone in the future uses the checked ways guaranteeing matching cols/vals. The `cols` feel has to remain pub for now as `rename` still directly mutates this field. See #11020 for challenges for this refactor. # Plugin-Author-Facing Changes This is a breaking change for outside plugins that relied on the `pub` fields.
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.