disable cloning and serialization

Author: withinboredom

src/AnyTime.php

@@ -87,6 +87,21 @@ public function inNanoseconds(): Nanoseconds
 
     abstract protected function toNanoseconds(): float|int;
 
+    public function __clone(): void
+    {
+        throw new \LogicException('Please use from() to clone.');
+    }
+
+    public function __wakeup(): void
+    {
+        throw new \LogicException('Please use from() to deserialize');
+    }
+
+    public function __sleep(): array
+    {
+        throw new \LogicException('Time cannot be serialized.');
+    }
+
     public function add(AnyTime $time): AnyTime
     {
         if ($time->spacetime !== $this->spacetime) {

tests/Unit/ExampleTest.php

@@ -36,6 +36,7 @@
     $secondInMs = Milliseconds::fromValue(1000);
     $second = Seconds::from($secondInMs);
     expect($second)->toBe(Seconds::fromValue(1));
+    expect($second)->toEqual(Seconds::fromValue(1));
 });
 
 test("Date intervals work", function () {
@@ -50,3 +51,13 @@
 
     expect($now->add($var->toDateInterval()))->toEqual($expected);
 });
+
+it('cannot be serialized', function () {
+    $var = Seconds(1);
+    expect(fn() => serialize($var))->toThrow(LogicException::class);
+});
+
+it('cannot be cloned', function () {
+    $var = Seconds(1);
+    expect(fn() => clone $var)->toThrow(LogicException::class);
+});