[development] Incremental upgrades

[Gabor Hojtsy]

Derek Wright wrote:
> So, hypothetically, the updates from 4.6.x to 4.7.x might have used some 
> function in 4.7.x core that no longer exists or works the same way in 
> 6.x.  If that was true, you couldn't just upgrade directly from 4.6.x to 
> 6.x, since when you hit the update function that only worked in 4.7.x 
> core, it would fail and then the rest of the upgrade path could be 
> busted.  Therefore, first upgrading from 4.6.x to 4.7.x, then from 4.7.x 
> to 5.x, and finally from 5.x to 6.x, is the safest, since you're always 
> running update functions against the version of core they were written 
> for and tested with.

There was exactly a node types API problem with updates from Drupal 4.6 
to 5.0 going directly: http://drupal.hu/english/node/8

Gabor