On 01/19/2015 06:33 AM, Stefan Monnier wrote:
>>     Prefer memset to repeatedly assigning Qnil
> 
> I don't know if I like this idea very much.  It's nice to make Qnil be
> represented by 0, but should we really rely on this all over the place,
> making it quasi-impossible to revisit this choice in the future?

If we can't rely on Qnil being 0, what's the point of making Qnil == 0
in the first place? If we can rely on Qnil being 0, we can put Lisp
variables in BSS, use memset, and perform other nice optimizations.