Puppet users - May 2014 - Hiera support for Aggregate Fact Resolution?

Is there a known way to do this or anything on the horizon that would make 
this functionality easier?

I am attempting to use facts.d to establish a list of 'roles' that
resolve
to locations in my hiera hierarchy (- roles/%{::roles}). Unfortunately it 
doesn't actually work as expected right now because hiera is restricted to 
interpolating values as strings instead of arrays or hashes, features added 
to facter in 2.0.  It will work one time but then puts the puppetmaster / 
passenger server in a weird state that requires touching a file in the 
manifest structure or restarting the server in order to continue working. 
 Further it only appears to access the first role when doing this which is 
an additional problem.

Having fully formed and functional support for this would allow me to 
eliminate huge amounts of repeated data in my current hiera structure so 
hopefully there is a way to get this doing what I want.
-Garrett

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