Feature request: permanent-local values in hooks buffer local values

["Lennart Borgman (gmail)" <lennart.borgman@gmail.com>]

For variables there is a property (permanent-local) you can set on them 
to make their buffer local value survive when changing major mode.

For buffer local values of hooks you can perhaps use that, but it 
probably does not do what you want. Some functions in a hook should 
survive changing major mode (for the same reasons that variables should 
do it), but other should not.

Could somehow a feature be added to hooks that fulfills the need I have 
sketched above?

Maybe the functions in the hook could have the property permanent-local? 
   kill-local-variable should then of course have to check if a variable 
is a hook. (To implement something like that add-hook could set a 
property on a hook variable saying it is a hook.)