Filling area chart with 0 on NaN values

[mariojst]

Is this a BUG REPORT or FEATURE REQUEST?:

Not quite sure, but I guess feature

type: feature

• Chartify version(s): 2.3.5

What happened:
I intend to plot an unstacked area chart, to compare different evolutions are respective results. With different areas not having all the same amount of rows.
Meaning, for instance, area A1 can go from 1 to 10 but area A2 may only have values from 1 to 8.
What is currently built now always assumes "nan" values to be considered 0, while this is not true and displays incorrect information.
Attachment 1 will shows the problem above.

What you expected to happen:
I expect the areas to stop their plot when there are no more X values belonging to them, instead of assuming 0.

How to reproduce it (as minimally and precisely as possible):
Create a dataset where one of the group_by columns does not contain the same amount of values as others

If any other information is required please let me know.
Thank you