Bugfixes: (i) PointTier and IntervalTier should begin with 0-value minTime/maxTime, otherwise stuff crashes when reading a tier with no points/interval; (ii) len() is the wrong interface for getting duration of an Interval, because the builtin semantics of len() is to return an integer no matter what---added a duration() method instead.
Bugfixes: (i) PointTier and IntervalTier should begin with 0-value minTime/maxTime, otherwise stuff crashes when reading a tier with no points/interval; (ii) len() is the wrong interface for getting duration of an Interval, because the builtin semantics of len() is to return an integer no matter what---added a duration() method instead.

kylebgorman/textgrid