fix: less strict obj checks for undefined and missing keys closes #4341

Author: logaretm

.changeset/eighty-zebras-listen.md

@@ -0,0 +1,5 @@
+---
+'vee-validate': patch
+---
+
+fix: less strict object checks for undefined and missing keys closes #4341

packages/vee-validate/src/utils/assertions.ts

@@ -163,9 +163,6 @@ export function isEqual(a: any, b: any) {
 
     keys = Object.keys(a);
     length = keys.length;
-    if (length !== Object.keys(b).length) return false;
-
-    for (i = length; i-- !== 0; ) if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
 
     for (i = length; i-- !== 0; ) {
       // eslint-disable-next-line no-var

packages/vee-validate/tests/useForm.spec.ts

@@ -1134,4 +1134,27 @@ describe('useForm()', () => {
       expect(document.body.innerHTML).toContain('aria-valid="true"');
     });
   });
+
+  // #4341
+  test('undefined field value should be the same as missing value when it comes to dirty', async () => {
+    let form!: FormContext<any>;
+    mountWithHoc({
+      setup() {
+        form = useForm({
+          initialValues: {
+            fname: '',
+          },
+        });
+
+        useField('fname');
+        useField('lname');
+
+        return {};
+      },
+      template: `<div></div>`,
+    });
+
+    await flushPromises();
+    expect(form.meta.value.dirty).toBe(false);
+  });
 });