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# Description Fixes: #11310 # User-Facing Changes After the change, the following code will go to error: ```nushell > def a [--x: int = 3] { "aa" } > let y = "aa" > a --x=$y Error: nu::parser::type_mismatch × Type mismatch. ╭─[entry #32:2:1] 2 │ let y = "aa" 3 │ a --x=$y · ─┬ · ╰── expected int, found string ╰──── ```
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.