Make Set|Bag|Mix.total caching, as suggested by grondilu++
Make sure Int/Num/Numeric/Real work on QuantHashes
Make :delete give a better error message if not supported on the object
Merge pull request #214 from timo/parameter_output_for_roles

for parametric roles, output the parameters, too
Make Type object coercer die if called with named parameters
typecheck the arguments of Array[Type].new.