twig implementation

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diff --git a/vendor/twig/twig/doc/filters/keys.rst b/vendor/twig/twig/doc/filters/keys.rst
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+``keys``
+========
+
+The ``keys`` filter returns the keys of an array. It is useful when you want to
+iterate over the keys of an array:
+
+.. code-block:: jinja
+
+    {% for key in array|keys %}
+        ...
+    {% endfor %}