Clojurians Log v2

I’m trying to understand the :compile function that can be included as part of reitit middleware. It seems that the result of the compile function can be different types. I have seen one example where a compile function returns a wrap function, which implies the compile function can be used to set up middleware in a similar fashion to standard ring, but with some additional logic. (i.e. testing some option and returning nil prevents the middleware from mounting). However, I have seen other compile functions that return a map with a data key that I assume is being used to manipulate the router configuration. https://github.com/metosin/reitit/blob/master/modules/reitit-middleware/src/reitit/ring/middleware/parameters.clj a wrap key is still provided, which I assume is because the result of compile function does not provide a wrap. Is it accurate to say that the use of the value returned from calling a compile function is conditional on the type? It seems that if a map is returned, the keys in that map will be merged into the router and can dynamically alter the behavior. If a function is returned, reitit assumes this is a pure wrap function and uses it directly as part of the middleware pipeline?