anchor.diff:             , map()
              , cowboy_router:constraints()) -> trail().
   trail(PathMatch, ModuleHandler, Options, MetaData, Constraints) ->
  -    #{ path_match  => PathMatch
  -     , handler     => ModuleHandler
  -     , options     => Options
  -     , metadata    => MetaData
  -     , constraints => Constraints
  -     }.
  +  #{ path_match  => PathMatch
  +   , handler     => ModuleHandler
  +   , options     => Options
  +   , metadata    => MetaData
  +   , constraints => Constraints
  +   }.
   
   -spec path_match(map()) -> string() | binary().
   path_match(Trail) ->
  
positive.code:     , Opts::any()}.
  -type route_rule() :: {Host::route_match(), Paths::[route_path()]}
    | {Host::route_match(), cowboy_router:constraints(), Paths::[route_path()]}.
  %%
  
  -type trails() :: [ trails:trail() | route_path() ].
  -export_type([trails/0]).
  
  -type method() :: get | put | post | delete | patch | head | options.
  
negative.code:    }.
  -export_type([trail/0]).
  
  %% Exported from cowboy_router.erl
  -type route_match() :: '_' | iodata().
  -type route_path() :: {Path::route_match(), Handler::module(), Opts::any()}
    | {Path::route_match()
  