Formatting macro with default arguments throws error

[spider-mane]

i get ERROR: Expected comma or ")" when attempting to format a macro with default parameter values such as

{% macro name(name = 'John') %}
  <h1>{{ name }}</h1>
{% endmacro %}

It's followed by The argument list of a macro can only consist of parameter names separated by commas.

Is this a mistake? Default arguments are valid after all.

[FNGR2911]

Same error here. Is there any way to ignore it?