Unexpected transformation of Map in LValue.asArray

[msangel]

The fix must affect only the "for" tag behavior, but should not affect other cases.
Existent code cause this test case to be broken:

    @Test
    public void shouldProperlyUseMapAfterFirstOnArrayOfMaps() {
        // given
        String hash = "{ \"x\": [{\"rating\": 4.5 }, {\"rating\": 7.2 }] }";
        String template = "{{ x | first | map: 'rating' }}";

        // when
        String rendered = Template.parse(template).render(hash);

        // then
        assertEquals("4.5", rendered);
    }
}

The fix to this is on the way.