CanMakeHandler reports whether a macro template needs a special macro's evaluator handler to be validated before procceed to the next handler(s).

MakeFilter returns a Filter which reports whether a specific macro template and its parameters pass the serve-time validation.

MakeHandler creates and returns a handler from a macro template, the handler evaluates each of the parameters if necessary at all.

ParamErrorHandler is a special type of Iris handler which receives any error produced by a path type parameter evaluator and let developers customize the output instead of the provided error code 404 or anyother status code given on the `else` literal.