I've always called this the "green-path prototype", which is building what you thought you knew, without implementing edge cases. The edge cases will get discov

I've always called this the "green-path prototype", which is building what you thought you knew, without implementing edge cases. The edge cases will get discovered and noted along the way and they should be documented (with a comment or other method that doesn't get lost). Pretty much any time you only handle a subset and don't handle the 'else's. The real implementation should consider the green-path and edge case notes, decide the desired structure/decomposition and pick and choose from the green-path rather than try to start with it as v1 of a final form.