added hidden preference option for APL-scalars in the settings menu

snap.html

@@ -10,7 +10,7 @@
         <script src="src/blocks.js?version=2020-06-20"></script>
         <script src="src/threads.js?version=2020-06-22"></script>
         <script src="src/objects.js?version=2020-06-20"></script>
-        <script src="src/gui.js?version=2020-06-08"></script>
+        <script src="src/gui.js?version=2020-06-22"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
         <script src="src/lists.js?version=2020-05-18"></script>
         <script src="src/byob.js?version=2020-06-08"></script>

src/gui.js

@@ -78,7 +78,7 @@ Animation, BoxMorph, BlockEditorMorph, BlockDialogMorph, Note*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2020-June-08';
+modules.gui = '2020-June-22';
 
 // Declarations
 
@@ -3437,6 +3437,30 @@ IDE_Morph.prototype.settingsMenu = function () {
         'check to enable\nusing operators on lists and tables',
         false
     );
+    if (Process.prototype.enableHyperOps) {
+        addPreference(
+            'APL-style scalars',
+            () => {
+                Process.prototype.enableAPLscalars =
+                    !Process.prototype.enableAPLscalars;
+                if (Process.prototype.enableAPLscalars) {
+                    Process.prototype.hyperDyadic =
+                        Process.prototype.hyperDyadicAPL;
+                    Process.prototype.hyperZip =
+                        Process.prototype.hyperZipAPL;
+                } else {
+                    Process.prototype.hyperDyadic =
+                        Process.prototype.hyperDyadicSimple;
+                    Process.prototype.hyperZip =
+                        Process.prototype.hyperZipSimple;
+                }
+            },
+            Process.prototype.enableAPLscalars,
+            'uncheck to disable treating (nested)\nsingle-itemlists as scalars',
+            'check to treat (nested)\nsingle-itemlists as scalars',
+            true
+        );
+    }
     addPreference(
         'Persist linked sublist IDs',
         () => StageMorph.prototype.enableSublistIDs =