Method append

benchmark/data-min.js:711–713

(t, e)

		return (this.sources.push(t), this);
	}
	append(t, e) {
		return (this.addSource({ content: new f(t), separator: (e && e.separator) || '' }), this);
	}
	clone() {
		const t = new S({ intro: this.intro, separator: this.separator });
		return (