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

[Dmitry Gutov]

On 07.11.2016 21:47, Eli Zaretskii wrote:

> > When thing is a number? Maybe. I don't imagine it's used very often.
>
> But previously it could be used.  After this change, it would be
> impossible.

The callers will need to switch to `number-at-point', probably. The 
resulting code will work with both new and older versions of Emacs.

> > It's pretty clearly a bug: most other "things" behave otherwise (list,
> > sexp, symbol). I'd very much rather we didn't retain conceptual problems
> > like that just for the sake of compatibility.
>
> Not sure which behavior you have in mind.  The removal of properties?
> Or something else?

Returning something other than a string or nil from thing-at-point.