fn desired_location<K: Hashable>(&self, key: &K) -> usize {
            if self.divisor == 0 { 0 }
            else {
                (key.hashed().into() / self.divisor).try_into().expect("divisor not large enough to force u64 into uisze")
            }
        }
Indicates both the desired location and the hash signature of the key.
differential-dataflow/src/trace/implementations/rhh.rs