src/vs/workbench/services/extensions/common/rpcProtocol.ts/MessageBuffer/writeBuffer
class MessageBuffer:	public writeBuffer(buff: VSBuffer): void {
		this._buff.writeUInt32BE(buff.byteLength, this._offset); this._offset += 4;
		this._buff.set(buff, this._offset); this._offset += buff.byteLength;
	}