Drain fake workflow tasks at their precise due timestamp

src/V2/WorkflowStub.php

@@ -549,12 +549,16 @@ public static function runReadyTasks(int $limit = 100): int
         $processed = 0;
 
         while ($processed < $limit) {
+            $query = self::taskQuery();
+            $dueAt = $query->getModel()
+                ->fromDateTime(now());
+
             /** @var WorkflowTask|null $task */
-            $task = self::taskQuery()
+            $task = $query
                 ->where('status', TaskStatus::Ready->value)
-                ->where(static function ($query): void {
+                ->where(static function ($query) use ($dueAt): void {
                     $query->whereNull('available_at')
-                        ->orWhere('available_at', '<=', now());
+                        ->orWhere('available_at', '<=', $dueAt);
                 })
                 ->orderBy('available_at')
                 ->orderBy('created_at')

tests/Feature/V2/V2WorkflowStubFakeTest.php

@@ -8,6 +8,7 @@
 use Carbon\CarbonImmutable;
 use Illuminate\Support\Facades\Date;
 use LogicException;
+use PHPUnit\Framework\Attributes\DataProvider;
 use RuntimeException;
 use Tests\Fixtures\V2\TestGreetingActivity;
 use Tests\Fixtures\V2\TestGreetingWorkflow;
@@ -358,6 +359,34 @@ public function testFakeModeCanDrainDueTimerTasksAfterTimeTravel(): void
             ->all());
     }
 
+    #[DataProvider('dueTaskTimestampCases')]
+    public function testFakeModePreservesTaskTimestampPrecision(string $startedAt, string $observedAt, bool $due): void
+    {
+        $this->travelTo(CarbonImmutable::parse($startedAt, 'UTC'));
+        WorkflowStub::fake();
+
+        $workflow = WorkflowStub::make(TestTimerWorkflow::class, 'fake-precise-timer');
+        $workflow->start(1);
+        $this->assertFalse($workflow->refresh()->completed());
+
+        $this->travelTo(CarbonImmutable::parse($observedAt, 'UTC'));
+
+        $this->assertSame($due ? 1 : 0, WorkflowStub::runReadyTasks());
+        $this->assertSame($due, $workflow->refresh()->completed());
+        $this->assertSame($due ? TimerStatus::Fired : TimerStatus::Pending, WorkflowTimer::query()->sole()->status);
+    }
+
+    /**
+     * @return iterable<string, array{string, string, bool}>
+     */
+    public static function dueTaskTimestampCases(): iterable
+    {
+        yield 'whole-second equality' => ['2026-01-02 00:00:00.000000', '2026-01-02 00:00:01.000000', true];
+        yield 'fractional equality' => ['2026-01-02 00:00:00.500000', '2026-01-02 00:00:01.500000', true];
+        yield 'elapsed within the same second' => ['2026-01-02 00:00:00.100000', '2026-01-02 00:00:01.400000', true];
+        yield 'future fractional deadline' => ['2026-01-02 00:00:00.500000', '2026-01-02 00:00:01.499999', false];
+    }
+
     public function testFakeModeRunsActivityAfterTimerWithImmutableApplicationDates(): void
     {
         Date::use(CarbonImmutable::class);