Re: Please add comments to isearch.el

[Juri Linkov]

>> Ohh, and I'd add also search-default-regexp-mode -> 
>> search-default-regexp-function
>> that currently causes confusion due to its similarity with 
>> isearch-regexp-function.
>
> The thing is that this variable is not necessarily a function, it can be
> nil or t too. I'd rather reserve the suffix "-function" for variables that
> necessarily hold a function.

A variable with the suffix "-function" is allowed to have a nil value,
but not t, indeed.  What about using a function instead of t, maybe ‘identity’?