Subject: bug#21391: 24.5; `thing-at-point' should return a string

From: Eli Zaretskii <[email-masked]>
Date: Fri, 11 Nov 2016 16:35:40 +0200

> From: Tino Calancha <[email-masked]>
> Date: Fri, 11 Nov 2016 23:13:55 +0900 (JST)
> cc: Tino Calancha <[email-masked]>, [email-masked], 
>     [email-masked]
> 
> The current implementation makes the things harder to understand.
> Currently one user need to read the source code to know the actual
> type this function returns.

If that's a problem, let's improve the doc string (and the manual, if
needed) to make this more clear.