Default value for date/time

[Brian Goetz]

> 
> Whats the default Currency? USD is a not an acceptable answer. Money
> is the same as it can't exist without a currency.

This is the point we’ve been trying to make.  Some types (like Complex) have a natural default (zero), others do not.  So the VM provides a uniform treatment — and then the class can be coded to interpret the default value whichever way makes sense for the domain.  If Complex has a natural zero, then you need not do anything special.  If Currency has no natural default, then a Currency whose bit pattern is the default bit pattern should be coded so its methods throw.