In talking to my colleagues, we're not comfortable w/ this serialization of `@draft` in this one and only place.  The 'fix' for this discomfort may go way beyond this PR to ensuring that preview uses the draft modulestore for all lookups and perhap only has the draft modulestore configured. We're moving to such a configuration in Studio. @nasthagiri is working on that. I haven't checked why `path_to_location` doesn't do the right thing and needs this, but perhaps you can?