Handle compactArrays option.

Author: davidlehn

lib/compact.js

@@ -385,8 +385,10 @@ api.compact = ({
               nestResult, itemActiveProperty, compactedItem,
               {propertyIsArray: (!options.compactArrays || container.includes('@set'))});
           } else {
-            // wrap using @graph alias, remove array if only one item
-            if(_isArray(compactedItem) && compactedItem.length === 1) {
+            // wrap using @graph alias, remove array if only one item and
+            // compactArrays not set
+            if(_isArray(compactedItem) && compactedItem.length === 1 &&
+              options.compactArrays) {
               compactedItem = compactedItem[0];
             }
             compactedItem = {