symfony · fabpot · Jun 14, 2017 · May 25, 2017
diff --git a/UPGRADE-3.4.md b/UPGRADE-3.4.md
@@ -10,11 +10,17 @@ Finder
 ------

 * The `Symfony\Component\Finder\Iterator\FilterIterator` class has been
-   deprecated and will be removed in 4.0 as it used to fix a bug which existed 
+   deprecated and will be removed in 4.0 as it used to fix a bug which existed
   before version 5.5.23/5.6.7.

 Validator
 ---------

 * Not setting the `strict` option of the `Choice` constraint to `true` is
   deprecated and will throw an exception in Symfony 4.0.
+
+Yaml
+----
+
+ * Using the non-specific tag `!` is deprecated and will have a different
+   behavior in 4.0. Use a plain integer or `!!float` instead.
diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
@@ -685,3 +685,6 @@ Yaml

 * The constructor arguments `$offset`, `$totalNumberOfLines` and
   `$skippedLineNumbers` of the `Parser` class were removed.
+
+ * The behavior of the non-specific tag `!` is changed and now forces
+   non-evaluating your values.
@@ -1,6 +1,12 @@
 CHANGELOG
 =========

+3.4.0
+-----
+
+ * Deprecated using the non-specific tag `!` as its behavior will change in 4.0.
+   It will force non-evaluating your values in 4.0. Use plain integers or `!!float` instead.
+
 3.3.0
 -----


@@ -611,6 +611,8 @@ private static function evaluateScalar($scalar, $flags, $references = array())
                    case 0 === strpos($scalar, '!str'):
                        return (string) substr($scalar, 5);
                    case 0 === strpos($scalar, '! '):
+                        @trigger_error('Using the non-specific tag "!" is deprecated since version 3.4 as its behavior will change in 4.0. It will force non-evaluating your values in 4.0. Use plain integers or !!float instead.', E_USER_DEPRECATED);
+
                        return (int) self::parseScalar(substr($scalar, 2), $flags);
                    case 0 === strpos($scalar, '!php/object:'):
                        if (self::$objectSupport) {

@@ -928,6 +928,7 @@ documents: 2

 ---
 test: Explicit typing
+deprecated: Using the non-specific tag "!" is deprecated since version 3.4 as its behavior will change in 4.0.
 yaml: |
   integer: 12
   also int: ! "12"

@@ -61,7 +61,7 @@ public function testSpecifications($expected, $yaml, $comment, $deprecated)
            restore_error_handler();

            $this->assertCount(1, $deprecations);
-            $this->assertContains('Using the comma as a group separator for floats is deprecated since version 3.2 and will be removed in 4.0.', $deprecations[0]);
+            $this->assertContains(true !== $deprecated ? $deprecated : 'Using the comma as a group separator for floats is deprecated since version 3.2 and will be removed in 4.0.', $deprecations[0]);
        }
    }