Unable to skip arguments in fragments when using keyword arguments

To Reproduce

Step by step instructions to reproduce the behavior:

Add to a page template:

{% fragment listNumbers(first, second, third=3, fourth=4) %}
  <p>{{ first }} {{ second }} {{ third }} {{ fourth }}</p>
{% endfragment %}

{% render listNumbers(1, 2) %}
{# Renders: `<p>1 2 3 4</p> #}

{% render listNumbers(1, third=9) %}
{# Renders: `<p>1  9 4</p> #}

Expected behavior

The rendered code should match the comments. Specifically, in the second example the “second” argument should be null. That is the behavior with Nunjucks macros.

Describe the bug

The missing second argument is passed an object of the keyword arguments instead:

{ third: 9, __keywords: true }

[abea]

Thanks for the reminder, @myovchev

[myovchev]

@abea The fix is merged so this could be closed?