fix serialization of PermissionStatus enum

example/ios/Runner.xcodeproj/project.pbxproj

@@ -222,7 +222,7 @@
 			);
 			inputPaths = (
 				"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
-				"${PODS_ROOT}/../.symlinks/flutter/ios-release/Flutter.framework",
+				"${PODS_ROOT}/../.symlinks/flutter/ios/Flutter.framework",
 				"${BUILT_PRODUCTS_DIR}/permission_handler/permission_handler.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";

ios/Classes/utils/Codec.swift

@@ -19,7 +19,8 @@ struct Codec {
         return PermissionGroup(rawValue: permissionString)!
     }
     
-    static func encodePermissionStatus(permissionStatus: PermissionStatus) -> String {
-        return permissionStatus.rawValue
+    static func encodePermissionStatus(permissionStatus: PermissionStatus) -> String? {
+        let status = "\"" + permissionStatus.rawValue + "\""
+        return status
     }
 }