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