from [comment](https://github.com/w3c/attribution/pull/309#discussion_r3013363219): Can we save the |isSingleEpoch| variable and have a method on an impression set that answers yes or no to [=is single epoch=]?
from comment: Can we save the |isSingleEpoch| variable and have a method on an impression set that answers yes or no to [=is single epoch=]?