Since we support both Elixir and Erlang modules, and are taking a string argument, modules have to be converted to the Erlang notation before being passed to various checks and to :meck. This means an Elixir module like Phoenix.LiveView would have to be converted to the atom :"Elixir.Phoenix.LiveView", but cowboy_handler remains :cowboy_handler. If they already prepended Elixir. then we pass the module as is.