Re: make defcustom automatically mark some variables as safe

[Stefan Monnier <monnier@iro.umontreal.ca>]

> What do people think of the idea of changing defcustom to give
> some variable types a safe-local-variable property by default?

> I mean that, eg, defcustom'ing a variable of :type integer would do:
> (put 'variable 'safe-local-variable 'integerp)

> Similarly for :type boolean (booleanp), string and regexp (stringp),
> and others where it makes sense.

I think this is wrong: one of the main changes in Emacs-22 w.r.t file-local
variables is that we made them safe: from no on, a file-local variable
should never be blindly accepted if we're not "sure" that it's safe.

So this would be a step backward since it would usually make good decisions
but not always (e.g. `enable-local-eval' could very well have been defined
with `:type boolean') so that would introduce security holes until someone
notices them.


        Stefan