Auto merge of #151853 - Zalathar:feed-vtable, r=oli-obk Use the query vtable in `query_feed` plumbing The `query_feed` function needs to be able to do two important things with (erased) query values: hash them, and debug-print them. Both of those are things that the query's vtable already knows how to do. So by passing in a vtable to `query_feed`, we can give it a nicer signature, avoid having to unerase values in the function itself, and clean up some caller-side code as well.
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