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# Description The second `Value` is redundant and will consume five extra bytes on each transmission of a custom value to/from a plugin. # User-Facing Changes This is a breaking change to the plugin protocol. The [example in the protocol reference](https://www.nushell.sh/contributor-book/plugin_protocol_reference.html#value) becomes ```json { "Custom": { "val": { "type": "PluginCustomValue", "name": "database", "data": [36, 190, 127, 40, 12, 3, 46, 83], "notify_on_drop": true }, "span": { "start": 320, "end": 340 } } } ``` instead of ```json { "CustomValue": { ... } } ``` # After Submitting Update plugin protocol reference
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.