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# Description Fixes issue [12828](https://github.com/nushell/nushell/issues/12828). When attempting a `polars collect` on an eager dataframe, we return dataframe as is. However, before this fix I failed to increment the internal cache reference count. This caused the value to be dropped from the internal cache when the references were decremented again. This fix adds a call to cache.get to increment the value before returning.
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.