Merge 'type_aware_update' into 'trunk'

Merge 'type_aware_update' into 'trunk'

r5713@Thesaurus (orig r5712):  ribasushi | 2009-03-08 23:53:28 +0100
Branch for datatype-aware updates
r6604@Thesaurus (orig r6603):  ribasushi | 2009-06-10 18:08:25 +0200
Test for type-aware update
r6607@Thesaurus (orig r6606):  ribasushi | 2009-06-10 19:57:04 +0200
Datatype aware update works
r6609@Thesaurus (orig r6608):  ribasushi | 2009-06-10 20:06:40 +0200
Whoops
r6614@Thesaurus (orig r6613):  ribasushi | 2009-06-11 09:23:54 +0200
Add attribute doc
r6620@Thesaurus (orig r6619):  ribasushi | 2009-06-11 16:15:53 +0200
Use equality, not comparison