+ * This is computed every time you call
+ * bt_clock_class_set_frequency() or
+ * bt_clock_class_set_offset(), as well as initially. It is the
+ * base offset in nanoseconds including both `offset_seconds`
+ * and `offset_cycles` above in the result. It is used to
+ * accelerate future calls to
+ * bt_clock_value_get_ns_from_origin() and
+ * bt_clock_class_cycles_to_ns_from_origin().
+ *
+ * `overflows` is true if the base offset cannot be computed
+ * because of an overflow.