breaking: change allowDuplicates default to false

@@ -33,7 +33,7 @@ class _BarcodeScannerWithControllerState
             MobileScanner(
                 controller: controller,
                 fit: BoxFit.contain,
-                allowDuplicates: false,
+                // allowDuplicates: true,
                 // controller: MobileScannerController(
                 //   torchEnabled: true,
                 //   facing: CameraFacing.front,

@@ -23,7 +23,7 @@ class _BarcodeScannerWithoutControllerState
           children: [
             MobileScanner(
                 fit: BoxFit.contain,
-                allowDuplicates: false,
+                // allowDuplicates: false,
                 onDetect: (barcode, args) {
                   setState(() {
                     this.barcode = barcode.rawValue;

@@ -33,7 +33,7 @@ class MobileScanner extends StatefulWidget {
       this.onDetect,
       this.controller,
       this.fit = BoxFit.cover,
-      this.allowDuplicates = true})
+      this.allowDuplicates = false})
       : super(key: key);
 
   @override