Puppet users - Feb 2014 - hiera-eyaml doesn't seem to work with the hiera_hash() function

I just started evaluating hiera-eyaml and hit a glitch. It seems that any 
attempt to read a hash in an eyaml file using hiera_hash(), produces an 
error:
"Error 400 on SERVER: Resolution type is hash but parsed_answer is a
Hash"
The error occurs even if the hash does not contain any encrypted values. 
One more detail:
- hiera( 'somehash' )  works fine
- hiera_hash( 'somehash' ) fails

I'm using heira-eyaml 2.0.0 on puppet 3.0.1.  Has anyone seen this before?

The following code snippets should reproduce the problem:

file: my_hiera.eyaml
somehash:
   foo: this is just a string

code:
  $a = hiera( 'somehash')  # This succeeds
  $b = hiera_hash('somehash')  # This fails

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