Clément Pit-Claudel <
address@hidden> schrieb am So., 2. Juli 2017 um 19:26 Uhr:
On 2017-07-02 12:54, Noam Postavsky wrote:
> On Sun, Jul 2, 2017 at 12:32 PM, Clément Pit-Claudel
> <address@hidden> wrote:
>>> Why would we need a new function since %n$ would be an error for the old format anyway?
>>
>> This in itself is a good reason to have a new function. A new function lets you migrate existing code, including plugins, to the new syntax, and load the polyfill in older Emacsen. A new syntax that causes errors in old Emacsen isn't usable by anyone outside of Emacs core, for fear of compatibility problems.
>
> We can still give a new name I suppose.
I think it would be nice, if we also write a polyfill. If we don't intend to write one, then there's probably no point.
We can't write a polyfill, just like browser developers can't write polyfills (if they do so, it's just normal functionality).
Third-party library authors can write polyfills, of course, if they want.