I imagine the premise of this post is basically to just kick off an exploration into TruffleRuby, which is cool! And an interesting read re: the benchmarking and performance of the implementation.

A shame that refinements don't really get much love, because the third option (in between monkey patching and extending the core library), is to use one of those.

    module DigWithFallback
      refine Hash do
        def dig_fetch(*keys)
          # ... impl
        end
      end
    end

    class SomeService
      using DigWithFallback

      def call(params)
        params.dig_fetch(:some, :key) { IdentityObject.new }
      end
    end