The only difference is the test constant: 0x10 for a data segment load, 0x15 for a far call target.
[7] B. E. Bayer: “An optimum method for two-level rendition of continuous-tone pictures” (1973). ↑
，这一点在WPS官方版本下载中也有详细论述
self.seen_urls.add(current_url)
* @param n 数组长度