Pub wishes serialization had a README and a LICENSE

pkg/serialization/README.md

+Serialization
+=============
+
+A general-purpose serialization facility for Dart Objects.
+
+This provides the ability to save and restore objects to pluggable
+Formats using pluggable Rules.
+These rules can use mirrors or be hard-coded. The main principle
+is using only public APIs on the serialized objects, so changes to the
+internal representation do not break previous serializations. It also handles
+cycles, different representations, filling in known objects on the 
+receiving side, and other issues. It is not as much intended for
+APIs using JSON to pass acyclic structures without class information,
+and is fairly heavweight and expensive for doing that compared to simpler
+approaches.
+ 
+For more detailed descriptions and examples of use, see the comment on
+the [serialization][serialization] library.
+
+[serialization]: https://api.dartlang.org/docs/channels/stable/latest/serialization.html