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K's coupling of data and user interface elements.

All data can have a gui widget type in its metadata.

The benefit was: * If you changed the widget then the data changed. * If you changed the data then the widget changed.

The layout of the data implied the layout of the widgets.

Using that version of k was the only time that I ever willingly did UI development.

i once did gui development in racket/gui. The dependency between widgets and variables is a pain to deal without something like that.

P.S: don't take this to mean i hate on racket, i'm just complaining about the default state of racket/gui, there have been attempts to improve it by 3rd party libraries(https://docs.racket-lang.org/gui-easy/index.html).

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