I understand what autoload does for functions (register file to load when such function is called or its documentation string is retrieved). However, it's not clear how to use autoload facility in conjunction with variables and macros.
I have two questions:
What happens when package has parameter, implemented as a variable that user can set, but it's not autoloaded? Should such variables be autoloaded? If not, it turns out that such variables do not exist, Lisp environment knows nothing about them, including their default values, until some autoloaded function from the package is used (typically after loading of configuration files), then if user sets them in his/her configuration file, it's like setting non-existing variable. If value of the variable is a non-empty list and user uses
add-to-listto change its value, what exactly happens? Are default values lost?
What happens when a macro is autoloaded? When should we autoload a macro?