JSONDeserializer.update 13.4上崩溃 、13.3上正常

崩溃位置为
public static func write(_ value: Any, to storage: UnsafeMutableRawPointer) {
guard let this = value as? Self else {
return
}
storage.assumingMemoryBound(to: self).pointee = this
}

Start at JSONDeserializer.update and the JSONDeserializer.write implementation shown in the issue, then reproduce the crash on Swift 13.4 while comparing behavior with 13.3. Trace the value cast and memory write to identify the regression; done means the update no longer crashes on 13.4 and existing behavior remains intact.

Written by the indexing model from the issue text.