Remove unused parameter
Add a little explanation
Small refactorings
Remove need to eval the middlespace symbol (it is really just a key)
Use a different key, :middleware-key
Use some longer, more meaningful names
Change handler-sym to handler-key
Remove unnecessary docstring formatting
Reduce the number of times the namespace metadata is obtained and evaluated
Get rid of :rook and :metadata Ring request keys
Introduce concept of namespace middleware