bitflag enum ui.BufferPropertySet.PropertyId
bitflag enum PropertyId { ReadParallelism, ReadBlockSize, ReadBufferSize, WriteBufferSize, KeepReadBlockSize, KeepWriteBlockSize, NotifyReadBufferFull, All = ReadParallelism | ReadBlockSize | ReadBufferSize | WriteBufferSize | KeepReadBlockSize | KeepWriteBlockSize | NotifyReadBufferFull, };