Time.diff gives wrong answer for leap years

[alikhajeh1]

Time.now
=> 2012-03-02 00:22:04 +0000
Time.diff(Time.now, Time.now+10.years)
=> {:year=>9, :month=>12, :week=>0, :day=>4, :hour=>18, :minute=>0, :second=>0, :diff=>"9 years, 12 months, 4 days and 18:00:00"}

9 years, 12 months and 4 days is clearly wrong. It should be 10 years.

[nielsenrechia]

time_diff_components = Time.diff(Time.parse('2013-08-28'), Time.parse('2014-08-28'))
=> {:year=>0, :month=>12, :week=>0, :day=>5, :hour=>0, :minute=>0, :second=>0, :diff=>"12 months, 5 days and 00:00:00"}

It should be just 12 months, right?