Issue #3020165 by alexpott: Dependency objects can be optimised for serialisation

core/lib/Drupal/Core/Extension/Dependency.php

@@ -190,4 +190,14 @@ class Dependency implements \ArrayAccess {
     return new static($name, $project, $version_string);
   }
 
+  /**
+   * Prevents unnecessary serialization of constraint objects.
+   *
+   * @return array
+   *   The properties to seriailize.
+   */
+  public function __sleep() {
+    return ['name', 'project', 'constraintString'];
+  }
+
 }

core/tests/Drupal/Tests/Core/Extension/DependencyTest.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\Core\Extension;
 
+use Drupal\Component\Version\Constraint;
 use Drupal\Core\Extension\Dependency;
 use Drupal\Tests\UnitTestCase;
 
@@ -100,4 +101,19 @@ class DependencyTest extends UnitTestCase {
     $dependency['name'] = 'foo';
   }
 
+  /**
+   * Ensures that constraint objects are not serialized.
+   *
+   * @covers ::__sleep
+   */
+  public function testSerialization() {
+    $dependency = new Dependency('paragraphs_demo', 'paragraphs', '>8.x-1.1');
+    $this->assertTrue($dependency->isCompatible('1.2'));
+    $this->assertInstanceOf(Constraint::class, $this->getObjectAttribute($dependency, 'constraint'));
+    $dependency = unserialize(serialize($dependency));
+    $this->assertNull($this->getObjectAttribute($dependency, 'constraint'));
+    $this->assertTrue($dependency->isCompatible('1.2'));
+    $this->assertInstanceOf(Constraint::class, $this->getObjectAttribute($dependency, 'constraint'));
+  }
+
 }