Numeric::Time is not consistent, giving confusing results to Duration#inspect

Is there a reason that ActiveSupport::CoreExtensions::Numeric::Time#minutes (and hours) don't their own unit as a type when creating an ActiveSupport::Duration ?

# for example
def hours
  ActiveSupport::Duration.new(self * 3600, [[:seconds, self * 3600]])
end
# could be
def hours
  ActiveSupport::Duration.new(self * 1.hour, [[:hours, self]])
end

The problem is that this creates confusing output for ActiveSupport::Duration#inspect

# for example
(1.month + 1.day + 5.minutes).inspect
=> "1 month, 1 day, and 300 seconds"

I have included a patch with tests to show this example

I can write the fixes, I just want to know if there is a reason for what is there.

as a side note, I found this bug because I wanted to add functionality for outputting a number in seconds to a sentence.

I wrote this: http://gist.github.com/69934 which I was planning to add to ActiveSupport::Duration until I noticed #inspect. Another question is? does it make sense to use ActiveSupport::Duration#inspect for user output? should I add something like the method I wrote that can pull apart a number in seconds and still output a nice sentence (like: 65.seconds.inspect # => "1 minute and 5 seconds")?