xero_make not taking $size correctly

Hi is first time I use Xero API module, well I was trying to use xero_make() for generate invoice structure just the same as the docs say:

$invoice = xero_make('invoice', 'recommended', array('name', 2));

Well the returned array is always the same minimal arrya, it just has type and contact, it returns the minimal $size, I tried changing the $size to 'all' but did not work, I did a dpm($size) in xero.make.inc in the function xero_make_invoice and the $size is always 'minimal'

so I had to hack the file and add 'recommended' as default instead of 'minimal'

Please how to fix this?