{% macro ft_call_params(param_prefix, ft, only_dyn=false) %}
{% if ft %}
{% for member_name, member in ft.members.items() %}
- {% if not only_dyn or member.field_type.size_is_dynamic %}
+ {% if not only_dyn or member.field_type.size_is_dynamic or member.field_type._is_len %}
, {{ param_prefix }}_{{ member_name }}
{%- endif %}
{% endfor %}