Wraps a raw AQL fragment so that aql() interpolates it verbatim into the resulting query string instead of binding it as a parameter. The fragment MUST come from a trusted source (validated whitelist, server-side enum, …) — never from raw user input.

Example:

$cursor = $db->query
(
    aql( 'FOR u IN users SORT u.name ? RETURN u' , aqlLiteral( 'DESC' ) )
) ;
// → "FOR u IN users SORT u.name DESC RETURN u"