Promoting to Complex

[Jonathan Worthington]

Jonathan Worthington wrote:
> chromatic wrote:
>> On Monday 27 September 2010 at 12:03, Jonathan Worthington wrote:
>>> However, at this point I'd be very surprised if we're still using 
>>> (in Rakudo) the Integer/Float PMCs for our Int/Num types after the 
>>> meta-model replacement lands.
>>>     
>>
>> What do Parrot's Int and Float PMCs need to be useful to Rakudo?
>>
>>   
> Sorry, I shoulda been a bit more explicit on the reasoning. The issue 
> isn't that they're not good enough, or that they need to change. 
> Rather, it's that as the meta-model design has started to come 
> together, I've mostly concluded they don't really fit in.
>
>  However, PMC inheritance today is really implemented as delegation - 
> something not in itself a problem [1], but a bit too heavyweight for 
> things as fundamental as Int and Num. The upshot today is that for an 
> Int we have:
>
Reference inclusion FAIL. I meant to add:

[1]  
http://www2.parc.com/csl/groups/sda/publications/papers/Chiba-ISOTAS96/for-web.pdf 
is essentially advocating a delegation-y approach to meta-class 
extension/compatibility issues.

Jonathan