I find this behavior highly undesirable, and consider it a bug. The globals dump should just add users, and not delete any.
Unless the --clean option is passed, yes I agree with you. The other issue is that it is silly to have to use pg_dumpall to get the globals. A person should be able to pull a pg_dump on a particular database and get everything that is required to run that database. Including users.
Another reason to combine pg_dumpall into pg_dump...
Chris
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