metamodel Util: added a method which gives the Class erasure for a TypeDescriptor
Java arrays: fixed model annotations and structure and bug in ObjectArray.copyTo
arrays_: use proper underlying array type
metamodel #262: support for JVM arrays
ObjectArray: actually keep in line with the rest of the java modules and pretend get returns T and generate null fence check
arrays_: own up to the fact that we accept iterables with nulls since arrays can store null