// Synchronously enqueue — this never applies backpressure
For implementers, this promise-heavy design constrains optimization opportunities. The spec mandates specific promise resolution ordering, making it difficult to batch operations or skip unnecessary async boundaries without risking subtle compliance failures. There are many hidden internal optimizations that implementers do make but these can be complicated and difficult to get right.
，更多细节参见Line官方版本下载
10 additional monthly gift articles to share
Фото: Leon Neal / Getty Images