fix: remove v4 options default assignment preventing native.randomUUID from being used

src/test/v4.test.ts

@@ -1,6 +1,7 @@
 import * as assert from 'assert';
-import test, { describe } from 'node:test';
+import test, { describe, mock } from 'node:test';
 import v4 from '../v4.js';
+import native from '../native.js';
 
 const randomBytesFixture = Uint8Array.of(
   0x10,
@@ -48,6 +49,26 @@
     assert.ok(id1 !== id2);
   });
 
+  test('should uses native randomUUID() if no option is passed', () => {
+    mock.method(native, 'randomUUID');
+
+    assert.equal((native.randomUUID as any).mock.callCount(), 0);
+    v4();
+    assert.equal((native.randomUUID as any).mock.callCount(), 1);
+
+    mock.restoreAll();
+  });
+
+  test('should not use native randomUUID() if an option is passed', () => {
+    mock.method(native, 'randomUUID');
+
+    assert.equal((native.randomUUID as any).mock.callCount(), 0);
+    v4({});
+    assert.equal((native.randomUUID as any).mock.callCount(), 0);
+
+    mock.restoreAll();
+  });
+
   test('explicit options.random produces expected result', () => {
     const id = v4({ random: randomBytesFixture });
     assert.strictEqual(id, '109156be-c4fb-41ea-b1b4-efe1671c5836');

src/v4.ts

@@ -6,8 +6,6 @@ import { unsafeStringify } from './stringify.js';
 function v4(options?: Version4Options, buf?: undefined, offset?: number): string;
 function v4(options?: Version4Options, buf?: Uint8Array, offset?: number): Uint8Array;
 function v4(options?: Version4Options, buf?: Uint8Array, offset?: number): UUIDTypes {
-  options ??= {};
-
   if (native.randomUUID && !buf && !options) {
     return native.randomUUID();
   }