Symbols are IFn (invoke as a map lookup)

('sym coll) / ('sym coll default) now do (get coll 'sym ...), like keywords —
a symbol is IFn on the JVM. jolt threw "cannot be cast to clojure.lang.IFn".
Pre-existing gap (not a regression), surfaced by honeysql's :checking mode,
which does ('where dsl) to look up a clause. honeysql 623/13/8 -> 635/8/1.
Corpus rows added.

host/chez/seq.ss

@@ -161,6 +161,7 @@
   (cond
     ((procedure? f) (apply f args))
     ((keyword? f) (apply jolt-get (car args) f (cdr args)))   ; (:k m [d]) -> (get m :k [d])
+    ((jolt-symbol? f) (apply jolt-get (car args) f (cdr args)))   ; ('s m [d]) -> (get m 's [d])
     ((jolt-coll? f) (apply jolt-get f args))                  ; (coll k [d]) -> (get coll k [d])
     ((jolt-transient? f) (apply jolt-get f args))             ; a transient vec/map/set is callable on the JVM
     ;; a record/reify implementing clojure.lang.IFn is callable: dispatch to its