just for my understanding: 'incore' not only mean that we will ignore the workingdir - but we will also not update any index, right? The incore version of the Dircache is not supposed to ever be persisted.
I do see that we will use DirCache.writeTree() in the end (which I think is permitted even on a incore DirCache) to write to the object database our merge result - but the index itself is not updated. Correct?