profiling class methods

During profiling some code using ruby 1.8.2 and standard profiler, I 
have discovered that class method execution time doesn't get attributed 
to the class where the method is defined. Instead it gets attributed to 
the class of the object issuing the call. This differs from the way 
instance methods are attributed. I'd expect that time gets attributed to 
the defining class instead.

I wonder whether this is by design and expected behavior, or a bug.

To verify this, you can run the following code through the profiler and 
run grep -e 'foo|bar' on the result.


==========================================================================================
class Base
  def self.foo
    100.times {|n| n-1}
  end
  def bar
    100.times {|n| n/1}
  end
end

class A < Base
end

class B < Base
end

class C < Base
  def self.foo
    100.times {|n| n+1}
  end
  def bar
    100.times {|n| n*1}
  end
end

a = A.new
b = B.new
c = C.new

a.class.foo
b.class.foo
c.class.foo

a.bar
b.bar
c.bar
==========================================================================================