4ae3d3116e
conj/assoc/dissoc/disj/pop/into and empty now thread the receiver's metadata onto the result, matching Clojure (each op constructs a new collection with meta() carried forward; coll.empty() is EMPTY.withMeta(meta())). The metadata side-table is now weak so meta on intermediate collections is reclaimed with them, and empty-list-t carries an (unused) field so a metadata-bearing () is a distinct identity from the shared singleton instead of leaking meta onto every (). Unblocks metadata-driven walks (aero/integrant): (into (empty form) ...) now preserves a vector/map/set's metadata, so a postwalk whose outer fn reads (meta x) sees it. |
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