Pass the Ruby array size in when validating elements.

Author: aardvark179

src/main/java/org/truffleruby/core/array/library/SharedArrayStorage.java

@@ -49,18 +49,18 @@ public SharedArrayStorage(Object storage) {
      * stack of adjacent objects have been shared, which may not be true at the point the storage is converted to shared
      * storage. */
     @TruffleBoundary
-    public boolean allElementsShared() {
+    public boolean allElementsShared(int size) {
         if (storage == null || storage instanceof ZeroLengthArrayStore) {
             return true;
         }
         ArrayStoreLibrary stores = ArrayStoreLibrary.getFactory()
                 .getUncached(storage);
-        var elements = stores.getIterable(storage, 0, stores.capacity(storage));
+        var elements = stores.getIterable(storage, 0, size);
         for (var e : elements) {
             if (e == null || !(e instanceof RubyDynamicObject) || SharedObjects.isShared(e)) {
                 continue;
             } else {
-                System.err.printf("Unshared element %s.\n", e);
+                assert false : String.format("Unshared element %s.\n", e);
                 return false;
             }
         }

src/main/java/org/truffleruby/language/objects/shared/SharedObjects.java

@@ -143,7 +143,7 @@ public static void writeBarrier(RubyLanguage language, Object value) {
     private static boolean validateArray(RubyArray value) {
         Object storage = value.getStore();
         assert storage instanceof SharedArrayStorage;
-        return ((SharedArrayStorage) storage).allElementsShared();
+        return ((SharedArrayStorage) storage).allElementsShared(value.size);
     }
 
     public static void propagate(RubyLanguage language, RubyDynamicObject source, Object value) {