70     this.blob = new Blob([this.blob, array.buffer], { type: this.contentType })
161       this.buffer.slice(this.cursor, this.cursor + size))
188   async readHeader(/** @type {Blob} */buffer) {  argument
189     this.buffer = await buffer.slice(0, _PAYLOAD_HEADER_SIZE).arrayBuffer()
193         this.buffer.slice(this.cursor, _MAGIC.length))
217   async readManifest(/** @type {Blob} */buffer) {  argument
218     buffer = await buffer.slice(
222       .decode(new Uint8Array(buffer))
226   async readSignature(/** @type {Blob} */buffer) {  argument
227     buffer = await buffer.slice(
231       .decode(new Uint8Array(buffer))