A new concept of method signature is introduces (reusing code, simplifying the message
sending syntax). In general the number of subjects was reduced. For example the subject content is no longer supported. The generic verbs are now used to set / get indexer / variable content.
anArray@3 indexer set:anObject
The subject bool was removed as well. Compare:
#if (anInteger >= -2147483646)bool'or:(anInteger <= 2147483647)?
#if (anInteger >= -2147483646)or:(anInteger <= 2147483647)?
I will post several tutorials describing 1.6.x features.