When start_val is after the last observation in a group, it will break because we try to apply seq.Date or seq.POSIXt from higher to lower. Rather we omit these groups and give a warning.
Same goes for the end_val that is before the first observation in a group.
When start_val is after the last observation in a group, it will break because we try to apply seq.Date or seq.POSIXt from higher to lower. Rather we omit these groups and give a warning.
Same goes for the end_val that is before the first observation in a group.