ISNULL            303 core/AvmCore-inlines.h 	return ISNULL(atom);
ISNULL            105 core/Namespace.h 			return ISNULL(m_prefix);
ISNULL            539 core/TypeDescriber.cpp 		else if (ISNULL(value))
ISNULL            460 core/VectorClass.cpp 		if (ISNULL(type))