Daniel Kraft wrote:
> 4) I've not done anything yet regarding converting '() -> %nil in lists
> that are seen from elisp; I think the final conclusion was that we want
> such a conversion, and so I will do that. But maybe I can try if it is
> reasonably possible to allow switching it off to regain performance
> without? Maybe also allow switching off the #f -> %nil conversion for
> booleans (t = #t).
I thought the point of the %nil work was to avoid the need for such
conversions. My %nil patch (in progress) includes a fast macro for
boolean testing from lisp, which considers (), #f, and %nil to all be
false.
If it is common to test for %nil using eq, then we could provide a
special eq which treats (), #f, and %nil as equal, part of the same
equivalence class.
> PS: I just remembered that the Elisp compiler still uses #f as %nil,
> although it can be switched easily at a single place. What's the status
> of the patch fixing %nil false-ness?
I'm working on an updated version of it.
Mark
