Ref assemblies produced by refout have more types than that produced by refonly

[jcouv]

Because the refout scenario binds method bodies (to emit the primary assembly), additional types and references are pulled in. For instance, anonymous types, closures, NoPia embedded types. We should be able to mark such types as synthesized and exclude them from refout output.

[gafter]

And we should do work in the future to reduce the scope of those differences.