Time Ranges
    data class TimeRanges(ranges: List<ClosedFloatingPointRange<Double>>) : List<ClosedFloatingPointRange<Double>> 
Represents one or more ranges of time, each specified by a start time and an end time.
Properties
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                  Returns the bounding time range from firstStart to lastEnd, or null if empty.
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                  Returns the start of the first range, or null if empty.