Ruby on Rails, before_filter and prepend_before_filter ordering is?

In the following example,

before_filter :foo
before_filter :bar
before_filter :wah
prepend_before_filter :heehee
prepend_before_filter :haha

so then the execution orders will be:

haha, heehee, foo, bar, wah?   <-- note that haha is actually before heehee

And is there a reason not to list haha and heehee first in the first place but actually use prepend?