🔧 Ensure correct types for commandLine

This commit ensures that arguments passed to `appendSwitch` and `appendArgument` are turned into strings before passing them over to the binding.

lib/browser/api/app.js

@@ -24,8 +24,20 @@ Object.assign(app, {
     return Menu.getApplicationMenu()
   },
   commandLine: {
-    appendSwitch: bindings.appendSwitch,
-    appendArgument: bindings.appendArgument
+    appendSwitch() {
+      let castedArgs = [...arguments].map((arg) => {
+        return typeof arg !== 'string' ? `${arg}` : arg
+      })
+
+      return binding.appendSwitch(...castedArgs)
+    },
+    appendArgument() {
+      let castedArgs = [...arguments].map((arg) => {
+        return typeof arg !== 'string' ? `${arg}` : arg
+      })
+
+      return binding.appendArgument(...castedArgs)
+    }
   }
 })