I saw a similar topic created about hlines. So, it would be
rather a feature request to add hlines rather than bug. Here is
fragment of conversation I am talking about for reference:
I start with
| Example | Text | Dates | other |
|---------+---------+--------------+---------|
| this | comment | <2022-01-28 vie> | nothing |
That is converted to
+---------+---------+--------------+---------+
| Example | Text | Dates | other |
+---------+---------+--------------+---------+
| this | comment | <2022-01-28 vie> | nothing |
+---------+---------+--------------+---------+
And is converted back to
| Example | Text | Dates | other |
| this | comment | <2022-01-28 vie> | nothing |
Couldn't in the last step the hlines be respected?
That would not make sense.
AFAIK, table.el has no notion of hlines. The +---+ separators in
table.el tables mark cell boundaries, not hlines.