Vector IDrop impl, elide another chunked-seq test in LITE_MODE

Author: swannodette

src/main/cljs/cljs/core.cljs

@@ -12436,6 +12436,13 @@ reduces them without incurring seq initialization"
               (recur (inc i) init)))
           init))))
 
+  IDrop
+  (-drop [v n]
+    (let [cnt (alength array)]
+      (if (< n cnt)
+        (prim-seq array n)
+        nil)))
+
   IComparable
   (-compare [x y]
     (if (vector? y)

src/test/cljs/cljs/collections_test.cljs

@@ -193,8 +193,10 @@
     (is (not (counted? (range))))
     (is (counted? (range 0 10 1)))
     (is (not (counted? (range 0.1 10 1))))
-    (is (chunked-seq? (range 0 10 1)))
-    (is (chunked-seq? (range 0.1 10 1)))
+    ;; no chunked seqs in :lite-mode
+    (when-not ^boolean LITE_MODE
+      (is (chunked-seq? (range 0 10 1)))
+      (is (chunked-seq? (range 0.1 10 1))))
     (is (= (range 0.5 8 1.2) '(0.5 1.7 2.9 4.1 5.3 6.5 7.7)))
     (is (= (range 0.5 -4 -2) '(0.5 -1.5 -3.5)))
     (testing "IDrop"