true if two time marks from the same time source represent the same moment of time, and
including the situation when the time marks were obtained from different time sources.
abstract fun equals(other: Any?): Boolean
Returns a hash code value for the object. The general contract of
abstract fun hashCode(): Int
Returns a time mark on the same time source that is behind this time mark by the specified duration.
fun <T : Comparable<T>> T.coerceIn(