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# Description From @maxim-uvarov's [post](https://discord.com/channels/601130461678272522/1227612017171501136/1228656319704203375). When calling `to-lazy` back to back in a pipeline, an error should not occur: ``` > [[a b]; [6 2] [1 4] [4 1]] | polars into-lazy | polars into-lazy Error: nu:🐚:cant_convert × Can't convert to NuDataFrame. ╭─[entry #1:1:30] 1 │ [[a b]; [6 2] [1 4] [4 1]] | polars into-lazy | polars into-lazy · ────────┬─────── · ╰── can't convert NuLazyFrameCustomValue to NuDataFrame ╰──── ``` This pull request ensures that custom value's of NuLazyFrameCustomValue are properly converted when passed in. Co-authored-by: Jack Wright <jack.wright@disqo.com>
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.