For completeness, add respond_to_missing?.

Author: ioquatix

lib/async/service/environment.rb

@@ -67,6 +67,10 @@ def method_missing(name, argument = nil, &block)
 						@facet.define_method(name){argument}
 					end
 				end
+				
+				def respond_to_missing?(name, include_private = false)
+					true
+				end
 			end
 
 			def self.build(...)