if !compatibleValueTypes(minType, t) {
			return nil, fmt.Errorf("incompatible types: %v %v", *minType, *t)
		}
		if ratio, _ := Scale(1, t.Unit, minType.Unit); ratio < 1 {
			minType = t
		}
	}
	rcopy := *minType
	return &rcopy, nil
}

func compatibleValueTypes(v1, v2 *profile.ValueType) bool {
	if v1 == nil || v2 == nil {
		return true // No grounds to disqualify.
	}
	// Remove trailing 's' to permit minor mismatches.