// Synchronously enqueue — this never applies backpressure
* 时间复杂度：O(n)，空间复杂度：O(1)
。WPS下载最新地址对此有专业解读
And one delightful discovery: Apple’s internal code references a Desctiptor (sic) in one of the class names. Even Apple engineers make typos in private APIs. :)
Ben Spencer, Cadan Murley and Seb Atkinson in frame