toString() {
				let s = `[${this.constructor.displayName}]`, f = true;
				for (const k in this) {
					if (this.hasOwnProperty(k)) {
						s += `${f ? ' {\n' : ''}  ${k}: ${typeof(this[k])}\n`;
						f = false;
					}
				}
				return s + (f ? '' : '}');
			}
Returns a string representation of this class.

@returns {string}
Returns a string representation of this class containing the
constructor functions `displayName` and describing the class
members and their respective types.