enum DocumentAttribute
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case documentAttributeImageSize(w: Int32, h: Int32)
case documentAttributeAnimated
case documentAttributeSticker(flags: Int32, alt: String, stickerset: Api.InputStickerSet, maskCoords: Api.MaskCoords?)
case documentAttributeVideo(flags: Int32, duration: Int32, w: Int32, h: Int32)
case documentAttributeAudio(flags: Int32, duration: Int32, title: String?, performer: String?, waveform: Buffer?)
case documentAttributeFilename(fileName: String)
case documentAttributeHasStickers