Extend Expand to APersistentMap on JVM - #794
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Cover all APersistentMap subclasses (including alt-runtime map impls) without naming concrete ArrayMap/HashMap classes. CLJS keeps the existing concrete map extensions. Signed-off-by: Karl Pietrzak <karl@medplum.com>
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September 4, 2026 13:58
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Summary
reitit.core/Expandtoclojure.lang.APersistentMapinstead of the concretePersistentArrayMap/PersistentHashMapclasses.Behavior for stock Clojure maps is unchanged (
expandstill returnsthis). Protocol dispatch continues to cache per concrete class after first resolve.This keeps route-data map expansion working for any
APersistentMapsubclass (e.g.PersistentTreeMap, and alternate JVM Clojure runtimes that provide their own map implementations under that hierarchy), without requiring library-specific reader features.Reason
Cloffle is a GraalVM/Truffle Clojure runtime with specialized map types that extend
APersistentMapbut notPersistentArrayMap/PersistentHashMap. Extending those concrete classes means Cloffle map literals missExpand; targetingAPersistentMapfixes that without changing stock Clojure behavior.We use
reititas part of our compatibility tests with Clojure, and we maintain this patch forreititinternally. This PR would help us avoid that, without any performance impact on reitit itself.