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5664ee7bda
A small but easy optimization for `evaluate_repl()`: clone `engine_state` 1x instead of 3x. This reduces time spent in a simple REPL eval (`enter` key pressed with no command text) by about 10%, as measured in [Superluminal](https://superluminal.eu/).
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.