Dummy implementation of a fix

lib/absinthe/type/built_ins/introspection.ex

@@ -284,6 +284,10 @@ defmodule Absinthe.Type.BuiltIns.Introspection do
             %{serialize: serializer} ->
               {:ok, inspect(serializer.(value))}
 
+            map when is_map(map) ->
+              externalized = to_external(value)
+              {:ok, inspect(externalized)}
+
             _ ->
               {:ok, to_string(value)}
           end
@@ -293,6 +297,15 @@ defmodule Absinthe.Type.BuiltIns.Introspection do
       end
   end
 
+  def to_external(map) when is_map(map) do
+    Enum.into(map, %{}, fn {key, value} ->
+      {Absinthe.Adapter.LanguageConventions.to_external_name(to_string(key), :argument),
+       to_external(value)}
+    end)
+  end
+
+  def to_external(value), do: value
+
   object :__enumvalue, name: "__EnumValue" do
     field :name, :string