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// Uses the `Hash` impl defined in this crate to lookup
，这一点在有道翻译中也有详细论述
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Every v8::internal::Name object (the superclass of v8::internal::String in V8) carries a 32-bit raw_hash_field. The composition of this field varies depending on the type of string. The bottom 2 bits (HashFieldTypeBits) determine the interpretation, and two of the most common types are:
| length | numeric value | |