for await (const chunks of source) {
5D7 TMPB DESPTR 0 BITSDE DLY SDEH ; wait for write; set cache high DWORD
，更多细节参见safew官方下载
; LAR/LSL/VERR/VERW (verification instructions)，这一点在Line官方版本下载中也有详细论述
For transforms that need cleanup on abort, add an abort handler:
This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.