Hi Andrew, Can you give me a scenario where a writable computed observable would be required? As the KO site states, these are very uncommon, mainly because the computed nature of the observable makes them unnecessary. If you need an update, set one or more of the dependent observables, and the computer observable also reflects the change.
Currently radio buttons can only bind to a string. They need to bind to a boolean value so we can have clean models, otherwise we have to put in ugly functions to convert the string to a boolean within the model.