e75771084e
core-merge returned {} for (merge) and errored on nil args. Rewrite to follow
Clojure: (when (some identity maps) (reduce conj (or (first maps) {}) (rest maps))).
- (merge) and (merge nil nil) -> nil
- nil args elsewhere are no-ops: (merge {} nil) -> {}, (merge nil {:a 1}) -> {:a 1}
- later args follow conj semantics: a map merges its entries, a [k v]
vector/map-entry adds that entry ((merge {} [:foo 1]) -> {:foo 1},
(merge {} (first {:a 1})) -> {:a 1})
- collection keys preserved (first arg's phm type kept; entries via core-assoc
which promotes struct->phm for collection keys)
spec: 9 new merge cases in maps-spec. merge.cljc 13/18/11 -> 29/11/2.
clojure-test-suite pass 1688->1704. jpm test green.
Remaining merge.cljc fails are the lenient-where-Clojure-throws class (atomic
args, >2-element vectors). Fixes jolt-dxx.
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