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diff --git a/vendor/doctrine/common/lib/Doctrine/Common/PropertyChangedListener.php b/vendor/doctrine/common/lib/Doctrine/Common/PropertyChangedListener.php
new file mode 100644
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+++ b/vendor/doctrine/common/lib/Doctrine/Common/PropertyChangedListener.php
@@ -0,0 +1,45 @@
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common;
+
+/**
+ * Contract for classes that are potential listeners of a <tt>NotifyPropertyChanged</tt>
+ * implementor.
+ *
+ * @link   www.doctrine-project.org
+ * @since  2.0
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ */
+interface PropertyChangedListener
+{
+    /**
+     * Notifies the listener of a property change.
+     *
+     * @param object $sender       The object on which the property changed.
+     * @param string $propertyName The name of the property that changed.
+     * @param mixed  $oldValue     The old value of the property that changed.
+     * @param mixed  $newValue     The new value of the property that changed.
+     *
+     * @return void
+     */
+    function propertyChanged($sender, $propertyName, $oldValue, $newValue);
+}