How to retrieve the raw enum input values in Absinthe?

I am trying to build an error message in the result of my GraphQL mutation and I need to include the value of an enum that was passed as input.

The problem is that when reading from the resolver’s args or resolution.definition.argument_data data, all I get is the corresponding atom (i.e. :blue) rather than the value in uppercase as passed by the GraphQL client (i.e. BLUE).

Is there a way to get the “raw” value passed in the mutation?