fix: Use pointers to key-value pair in unordered map #422
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References and pointers do not get invalidated when rehashing of the unordered map happens. This does not hold for iterators, however.
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This PR fixes a bug from #420.
References and pointers do not get invalidated when rehashing of the unordered map happens. This does not hold for iterators, however. Therefore, we need to use pointers for worklist to be sure that the pointed to key-value pairs are still valid when new elements have been inserted in the map.