There’s a special case here: if the map contains a register at the given key, but the register contains null, the map is considered to not contain the key.
type PointerArg[T] = typing.GetArg[T, Pointer, Literal[0]]。PDF资料对此有专业解读
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That’s still quite far from Vapi’s ~840ms latency for a comparable configuration - more than twice as slow. At that point, the delay becomes noticeable. Conversations start to feel hesitant. Pauses stretch just long enough to feel awkward.，这一点在PDF资料中也有详细论述
And now, let's bring out the power tools!
The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.