I finally figured out how to apply a functional / unidirectional data flow architecture to the (demanding) case of an editor. And yes, there are plans to integrate this into CodeMirror at some point.
That. And also how to deal with the interaction between browser state (around IME and such) and the component state. And how to properly model updates (see thread [1]) in a way that plugins can extend and consume in a modular way.
