for type namespace, startswith("sqlalchemy") catches things like "sqlalchemy_utils"

**Migrated issue, originally created by Michael Bayer ([@zzzeek](https://github.com/zzzeek))**

e.g.:


```
    elif mod.startswith("sqlalchemy"):
        prefix = _sqlalchemy_autogenerate_prefix(autogen_context)
        return "%s%r" % (prefix, type_)
    else:
        prefix = _user_autogenerate_prefix(autogen_context, type_)
        return "%s%r" % (prefix, type_)

```

