I've had another idea if we want to be able to have a single field but eliminate the confusion. Field 'Is Regression', with possible values: - Yes, range known - Yes, range needed - Yes, range not needed - No - --- (These are the same values proposed in comment 23, just with a different field name and options wording to make them clear-cut).
Bug 1534280 Comment 26 Edit History
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I've had another idea if we want to be able to have a single field but eliminate the confusion. Field 'Is Regression', with possible values: - Yes, range known - Yes, range needed - Yes, range not needed - No - '---' (These are the same values proposed in comment 23, just with a different field name and options wording to make them clear-cut).