Why not install pgstattuple by default?

Hackers,

I've run into a couple of occasions lately where I really wanted
pgstattuple on a production server in order to check table/index bloat.
 However, in the production environment at a large site installing a
contrib module can involve a process which takes days or weeks.

Is there some reason why the stattuple functions aren't just available
as core functions?  Are they unsafe somehow?

-- 
-- Josh Berkus
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Josh Berkus                       PostgreSQL Experts Inc.
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