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Hi, To my surprise hashes passed to class parameters pulled from hiera with :merge_behavior: deeper, are not merged "as expected", where as hiera_hash does work "as expected". Or to rephrase: they behave differently, despite merge_behavior being set. I found a snippet documenting this here: http://docs.puppetlabs.com/hiera/1/lookup_types.html#deep-merging-in-hiera--120