This document provides a simple example how one could implement a native type in dart type system. https://docs.google.com/document/pub?id=1zGU2wTXPP4REwCQ-nLmXc_Cqe32RBRxGVL7HNI7F2jk [googleapps domain=”docs” dir=”document/pub” query=”id=1zGU2wTXPP4REwCQ-nLmXc_Cqe32RBRxGVL7HNI7F2jk&embedded=true” /]