And yet that's what we're confronted with, implicitly, when we use
it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
，这一点在safew官方下载中也有详细论述
return this.#data.get(key)?.value !== null;
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