Improve show performance by only evaluating each :render-fn once
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:render-fn once
# Conflicts: # src/nextjournal/clerk/viewer.cljc # test/nextjournal/clerk/viewer_test.clj
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Previously each node in the viewer tree would carry a viewer node and so we'd read and evaluate it multiple times. Now we build up a lookup table from hash to viewer and do it only once per unique viewer.
TODO:
(concat (range 20) [#{1 2 3} :foo])