I spent hours trying to prove I'm wrong about it or that I miss some configuration options or a standard that must be followed. Didn't find anything, so let's try here...

Basically: I find it impossible to redirect from a custom module's view to an URL that contains special characters (I am mostly talking about brackets for unordered params). The URL gets entirely encoded so that redirect URL becomes something like this:
/content/view/full/999/%28xparam%29/value
instead of:
/content/view/full/999/(xparam)/value

I've assembled my own hack methods around it, but still would like to have it working be default, since it's more and more in use.

I've covered this in the forum:
http://ez.no/developer/forum/developer/redirecting_from_own_module_to_an_url_with_unordered_params

Steps to reproduce

1) Create your own module with at least one view
2) Try to redirect that view to any URL that contains unordered URL parameters