Struct {
    timeline: utf8
    range: Struct {
        start: DenseUnion {
            0 = "_null_markers": nullable null
            1 = "CursorRelative": int64
            2 = "Absolute": int64
            3 = "Infinite": nullable null
        }
        end: DenseUnion {
            0 = "_null_markers": nullable null
            1 = "CursorRelative": int64
            2 = "Absolute": int64
            3 = "Infinite": nullable null
        }
    }
}