Re: Horizontal Tab and Line Feed are non-ASCII according to the ASCII category

[Stefan Monnier]

>> I hope we don't plan on changing _anything_ in this regard before the
>> release, no matter what we find in the specs.  The cited fragment from
>> characters.el has been there since before Emacs moved into CVS in 1997!

> How is the age of the bug relevant?  Searching for ASCII characters
> with \ca matches different characters than searching for ASCII class
> characters with [:ascii:].  Surely that's a bug that needs fixing,
> rather than a feature to be added later isn't it?

> We're not required to follow the spec, but it's not good to use 2
> different definitions of ASCII.

The flip side is obvious: why make \ca behave like [[:ascii:]]?
If you want [[:ascii:]] you know where to find it.


        Stefan