Hi,that was a fast one tho .. the 'problem' is the new YAML parser (Psych vs Syck) - while Syck was accepting the default YAML shipped by hiera, Psych was not .. at least now 'hiera' itself seems to work flawlessly on 1.9.1
Gonna take a look into hiera-puppet tomorrow .. seems as if this will have a good outcome shortly! ;-)
+ I will inform upstream about this regards, Patrick