bug#27979: tab completion for "(yes or no)?"

[Drew Adams]

> IMO, Emacs prefers `yes-or-no-p' for dangerous actions, and it
> uses `y-or-n-p' for safe ones.  I think this is good, to protect
> beginners from lost important data; offering TAB completion would
> somehow contradict this idiom.

+1
 
> Some experts have in their Emacs init file:
>   (fset 'yes-or-no-p 'y-or-n-p)
> So that they will be prompted with (y or n).

More newbies than experts, methinks. ;-)