Why is null lowercase?

[Maxim Fomin]

On Friday, 25 January 2013 at 14:22:20 UTC, Don wrote:
> On Friday, 25 January 2013 at 01:17:44 UTC, Ali Çehreli wrote:
>> On 01/24/2013 12:42 PM, Matthew Caron wrote:
>>
>> >> for not null checks
>> >>
>> >> if ( ptr !is null) ...
>> >
>> > And too much perl has me wanting to write:
>> >
>> > if (ptr is not null)
>>
>> IIRC, the !is operator is thanks to bearophile.
>
> No, it's from 2002 (well, it was !==, renamed to !is in 2005).
> Bearophile only joined us about the time D2 began, in late 2007.

It would be nice a to have a wiki page about D history written by 
old-timers.