Thanks for the responses everyone and the reality check of how new features get in. I will look into the suggestion by Vijaykumar in more detail and try it out.
You just need to export dump without any privileges. And while restoring dump use the new role.
You should read the body of the original email and not just the subject line. The actual question pertains to schemas - which IIUC are tightly linked to roles in other DBs (hence the observed behavior elsewhere) but aside from some default search_path stuff are unrelated in PostgreSQL.
