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# Description Before this PR, `to msgpack`/`to msgpackz` and `to json` serialize closures as `nil`/`null` respectively, when the `--serialize` option isn't passed. This PR makes it an error to serialize closures to msgpack or JSON without the `--serialize` flag, which is the behavior of `to nuon`. This PR also adds the `--serialize` flag to `to msgpack`. This PR also changes `to nuon` and `to json` to return an error if they cannot find the block contents of a closure, rather than serializing an empty string or an error string, respectively. This behavior is replicated for `to msgpack`. It also changes `to nuon`'s error message for serializing closures without `--serialize` to be the same as the new errors for `to json` and `to msgpack`. # User-Facing Changes * Add `--serialize` flag to `to msgpack`, similar to the `--serialize` flag for `to nuon` and `to json`. * Serializing closures to JSON or msgpack without `--serialize` Partially fixes #11738
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.