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I 'borrowed' a function from some deprecated mode

Puppet::Parser::Functions::newfunction(:is_classified_with, :arity => 1,
                                       :type => :rvalue) do |(str)|
  compiler.node.classes.keys.include?(str)
end

That likely shows which classes were added to the node definition, usually by the ENC. Which is related to which Classifier Groups the node was matched to, but not quite the same.

PE uses some secret sauce in classification, so

defined

function never worked to detect those classes