TYPO3.Flow

Given this route as the only active route:

-
  name: 'foo'
  uriPattern: 'foo(/{@action})'
  defaults:
    '@package': 'Acme.Demo'
    '@controller': 'Foo'
    '@action': 'index'

and a controller with this action:

/**
 * @param \Acme\Demo\Domain\Model\Foo $foo
 * @param string $bar
 */
public function removeBarAction(Foo $foo, $bar) {}

The following all works fine and results in a link being built (foo is an object):

<f:link.action action="removeBar" arguments="{foo: foo}">
<f:link.action action="removeBar" arguments="{xyz: foo}">
<f:link.action action="removeBar" arguments="{foo: foo, bar: foo}">

But this does not work (bar is a string):

<f:link.action action="removeBar" arguments="{foo: foo, bar: bar}">

The following happens inside the router:

So the arguments that are objects are considered internal, because there __ is involved…