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The `keys()` function returns an array containing all keys of the given
dictionary value. The keys are sorted in declaration order.
-- Testcase --
{{ keys({ "foo": true, "bar": false, "qrx": 123 }) }}
-- End --
-- Expect stdout --
[ "foo", "bar", "qrx" ]
-- End --
If the given argument is not a dictionary, the function returns `null`.
-- Testcase --
{{ keys(true) === null }}
-- End --
-- Expect stdout --
true
-- End --
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