Fixed error in handling return values associated with Tail Recursion. Fixed problems with list literals. Fixed array iteration protocol. Fixed value return specifications. GF method specializers are now required to match the GF specializers.
Setters now work in prefix mode.
Setters are now DIRM compliant. Also fixed it not to check for extraneous keyword parameters if the argument is a GF rather than method. Setter methods specialize the argument parameter to the appropriate type, providing type-safe slot values. Slot type evaluation is now lazier. This supports forward reference to other classes.