On 05/10/2012 04:21 AM, Nicolas Cellier wrote:
> Sure, I already changed various Number>>hash and could as well change
> Point hash to follow recommendations from Andres valloud book hashing
> in smalltalk...
>
> Nicolas

DateAndTime>>#hash could be changed to :

hash
	^ (jdn hashMultiply bitXor: seconds + offset asSeconds) bitXor: nanos

which is 130x faster than whats currently in the image:

hash
	^ self asUTC ticks hash


The collision rate on the proposed hash function is 0.04% ( 4 per 10,000 )