{a} shorcut for hashes does not work

According to Twig docs, you can declare a hash like:

{# keys can be omitted if it is the same as the variable name #}
{ foo }
{# is equivalent to the following #}
{ 'foo': foo }

https://twig.symfony.com/doc/3.x/templates.html#literals

However, Twing seems to have accidentally omitted that from its parser. If you try the above you'll get an error for 'A hash key must be followed by a colon (:)'.

Twig PHP has slightly different code: https://github.com/twigphp/Twig/blob/3.x/src/ExpressionParser.php#L368-L377

Twing: https://gitlab.com/nightlycommit/twing/-/blob/main/src/lib/parser.ts#L849-860

It would be ideal if the small divergence could be solved, or explained in known issues.