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kotlinlang

Hi everyone! And especially Kotlin DataFrame users :slightly_smiling_face:.

We're currently in the process of overhauling the Columns Selection DSL. This is the DSL that is used all across the library when you need to select multiple columns, such as `select {}`, `remove {}`, `groupBy {}`, `update {}`, etc.
This overhaul includes lots of KDocs, adding missing overloads for access APIs and generally making it more readable, predictable and easier to use. However, we could really use your feedback!

If you have the time, please take a look at the [Github Discussion](<https://github.com/Kotlin/dataframe/discussions/396>) created for this. It links to a Kotlin Notebook demoing some of the changes and, most importantly, showing my concerns and the options we have to fix them.
Feedback will be greatly appreciated!