Affects versions: 1.9.908
Fix versions: None
This is similar to CLJS-2065 Closed and further improves the performance by avoiding reduce and using a key iterator instead.
Results for a large CLJS project with lots of namespaces are:
- Initial compile (cold) Old: 11.4s New: 11.2s
- First full recompile: Old: 6.8s New: 5.9s
- After a few full recompiler (warmed up JVM): Old: ~6.1s New: 5.1s
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