Occurrences in DST change hour get skipped

[avit]

I found that a 2AM rule would get skipped as it traverses the DST boundary:

schedule = IceCube::Schedule.new(Time.local(2013, 3, 9, 2, 0, 0))
schedule.rrule IceCube::Rule.daily
schedule.first(2)
# => [2013-03-09 02:00:00 -0800, 2013-03-11 02:00:00 -0700]

The occurrence on March 10th gets skipped. Instead of skipping a day because there's no 2AM there, It should validate the nearest hour (3AM). This applies to all recurrence rules.

When hour_of_day(2) is specified as an override to the schedule start time it seems that it should also consider DST changes and use the nearest hour, based on section 3.3.5 and referenced in 3.3.10 for BYHOUR on page 45.