> IMO, just use one single # as you did at the start, and don't worry about the 
> comment_use_indent comment comment comment (oops, got carried away 🙃).
> `#`  as documentation comments in conffiles is most common
> `#`key=value as commented-out default/suggestion is common (many things in 
> e.g. /etc do this)
> `##`  is a lot less common, so is #~  indeed.

OK.

> The one thing you possibly could do is still add a leading # to the 
> \t#comment line, e.g. "if line is an indented comment, add a documentation 
> comment prefix", but that might be an overly specific case to warrant it, and 
> special cases have a tendency to come back to bite you…

I don't think we should do anything about this in the code - but I think we 
should modify this comment in all the conf files so it already contains the 
leading `#` so we ship conf files with valid syntax. I'll create a separate PR 
for this.

> Wait, if we don't need to handle leading whitespaces (which we don't need 
> AFAIK, although it might be nice), the logic is merely if (*line && *line != 
> '[' && *line != '#') comment();, isn't it?

Yes, but I also think we shouldn't add `#` on empty lines or lines containing 
only whitespaces.

> Hum, I'm not sure it's a great idea. Some settings make sense to be modified 
> per-filetype rather than necessarily globally, and I think those are the ones 
> showing up in filetypes definitions. E.g. comment_use_indent: it's both a 
> user preference, but also not all languages are happy about it, or their 
> canonical style isn't. Similarly, wordchars has some use per-filetype, where 
> identifiers are not limited to the usual (say, they contain - for example).
So yeah, there surely is room for improvement, but I don't think going whole 
"no non-overriden settings can ever be mentioned in filetype definitions" is 
the best move.

OK.

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