Has something changed regarding the way dictionaries are treated compared to 0.6.3?
I am trying to migrate some Python code to 0.7 which - since there's no interaction whatsoever with the Revit API - in theory should not need any massaging at all. Instead I get this warning:

Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed. 
'string' does not contain a definition for 'Key'

@holyjewsus - I know you've been working with Python dictionaries as well. Any thoughts?
File is here:
https://github.com/CAAD-RWTH/ClockworkForDynamo/blob/master/issues/3100_Python_dictionaries.dyn