Add contract of equals to EntityDocument

Author: Benestar

src/Entity/EntityDocument.php

@@ -54,4 +54,18 @@ public function setId( $id );
 	 */
 	public function isEmpty();
 
+	/**
+	 * @see Comparable::equals
+	 *
+	 * Two entities are considered equal if they are of the same
+	 * type and have the same value. The value does not include
+	 * the id, so entities with the same value but different id
+	 * are considered equal.
+	 *
+	 * @param mixed $target
+	 *
+	 * @return bool
+	 */
+	public function equals( $target );
+
 }

src/Entity/Item.php

@@ -300,12 +300,7 @@ public function setStatements( StatementList $statements ) {
 	}
 
 	/**
-	 * @see Comparable::equals
-	 *
-	 * Two items are considered equal if they are of the same
-	 * type and have the same value. The value does not include
-	 * the id, so entities with the same value but different id
-	 * are considered equal.
+	 * @see EntityDocument::equals
 	 *
 	 * @since 0.1
 	 *

src/Entity/Property.php

@@ -190,12 +190,7 @@ public static function newFromType( $dataTypeId ) {
 	}
 
 	/**
-	 * @see Comparable::equals
-	 *
-	 * Two properties are considered equal if they are of the same
-	 * type and have the same value. The value does not include
-	 * the id, so entities with the same value but different id
-	 * are considered equal.
+	 * @see EntityDocument::equals
 	 *
 	 * @since 0.1
 	 *