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+``length``
+==========
+
+.. versionadded:: 1.33
+
+    Support for the ``__toString()`` magic method has been added in Twig 1.33.
+
+The ``length`` filter returns the number of items of a sequence or mapping, or
+the length of a string.
+
+For objects that implement the ``Countable`` interface, ``length`` will use the
+return value of the ``count()`` method.
+
+For objects that implement the ``__toString()`` magic method (and not ``Countable``),
+it will return the length of the string provided by that method.
+
+.. code-block:: jinja
+
+    {% if users|length > 10 %}
+        ...
+    {% endif %}