What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
十年後，我們兩房一廳的公寓塞滿了東西和兩個孩子，那天我決定必須把它清掉，真是令人傷感。它自從我離開大學後便積滿了塵埃，但同時也象徵著我曾經對語言學習的認真投入。
，这一点在爱思助手下载最新版本中也有详细论述
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Crash regression for state machine conflicts: A test specifically checks that calling byobRequest.respond() after enqueue() doesn't crash the runtime. This sequence creates a conflict in the internal state machine — the enqueue() fulfills the pending read and should invalidate the byobRequest, but implementations must gracefully handle the subsequent respond() rather than corrupting memory in order to cover the very likely possibility that developers are not using the complex API correctly.