Liquid Newline Quirks using include tag

I was creating a CSV export Liquid template for a client. In this template I wanted smart includes to add some dynamic data.

But to my surprise the output of liquid includes added newlines. This is not what you want in a CSV file. Because a newline means the next row in the CSV file.

My code looked like this:

{%- assign complexDataStringsArray = "drilling_info,extra_info,rooting" | split: ',' -%}
{%- for measurement in array -%}
{%- for term in site.csv_content -%}
{%- if complexDataStringsArray contains term -%}
{%- assign path = term | prepend: "includes/csv_export_" -%}
{%- include path -%}
{%- else -%}
{{ measurement[term] }}
{%- endif -%}{%- unless forloop.last -%},{%- endunless -%}
{%- endfor -%}
{%- endfor -%}

See the part {%- include path -%}? Even when I used the dashed version of the include tag, it still added a newline.
The output of the include part code was always this:

,actual text or rooting

So while trying everything like removing al newlines in code and making one big line of code it still added newlines.


But I did found a solution:
The included file had:

actual text or {{ term }}

And changed this to:

{%- capture rooting -%}
jo mamama
{%- endcapture -%}
{{- rooting -}}

And now the output was:

id,drilling_info,extra_info,jo mamama

Et voila! No newlines anymore. Yeey!