| http://www.w3.org/ns/prov#value | - The way R behaves when zero is used as a subscript when replacing elements is particularly bad, since doing nothing at all can easily lead to an apparently working program that produces wrong answers. (The behaviour of returning an empty vector when zero is used as a subscript when extracting an element is more likely to produce an error later on, so that at least the problem will be evident.)
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