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If we allow DocumentFragments to be generated with nanohtml (choojs/nanohtml#118), then we should make sure that they can't be used to morph the existing tree.
Morphing with a DocumentFragment doesn't make sense, because it doesn't have an actual root node.
Potentially we could also define that if a DocumentFragment is used it will only morph the children of the rootTree. That would also solve #96. But I think that should be discussed further somewhere.
For now this is my proposal: I added an assert statement, so it will reject DocumentFragments.