private static _flaten(obj: any, result: {[key: string]: any }, order: number = 0, prefix?: string): void {
		if (!obj) {
			return;
		}

		for(var item of Object.getOwnPropertyNames(obj)){
			const value = obj[item];
			const index = prefix ? prefix + item : item;

			if (Array.isArray(value)) {
				result[index] = safeStringify(value);

			} else if (value instanceof Date) {
				// TODO unsure why this is here and not in _getData
				result[index] = value.toISOString();

			} else if (isObject(value)) {
				if (order < 2) {
					AIAdapter._flaten(value, result, order + 1, index + '.');
				} else {
					result[index] = safeStringify(value);
				}
			} else {
				result[index] = value;
			}
		}
	}

	test('safeStringify', function () {
		let obj1: any = {
			friend: null
		};

		let obj2: any = {
			friend: null
		};

		obj1.friend = obj2;
		obj2.friend = obj1;

		let arr: any = [1];
		arr.push(arr);

		let circular: any = {
			a: 42,
			b: null,
			c: [
				obj1, obj2
			],
			d: null
		};

		arr.push(circular);


		circular.b = circular;
		circular.d = arr;

		let result = objects.safeStringify(circular);

		assert.deepEqual(JSON.parse(result), {
			a: 42,
			b: '[Circular]',
			c: [
				{
					friend: {
						friend: '[Circular]'
					}
				},
				'[Circular]'
			],
			d: [1, '[Circular]', '[Circular]']
		});
	});