It seems lists should be rendered as a "".join(list)?

[epage]

Example test:

    assert_template_result!(
        "abc",
        r#"{{ ary | map:"foo" | map:"bar" }}"#,
        v!({"ary": [{ "foo": { "bar": "a" } }, { "foo": { "bar": "b" } }, { "foo": { "bar": "c" } }]}),
    );