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This one is a bit more involved. Of note is the fact that it at present only uses local flow when determining the origin of some value (whereas the points-to version used global flow). It may be desirable to rewrite this query to use global data-flow, but this should be done with some care (as using "all unhashable objects" as the set of sources is somewhat iffy with respect to performance). For that reason, I'm sticking to mostly local flow (except for well behaved things like types and built-ins).