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Document tradeoffs between `isInstanceOf` and `as`/`assertIs`. #1780

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Document tradeoffs between `isInstanceOf` and `as`/`assertIs`.

Document tradeoffs between `isInstanceOf` and `as`/`assertIs`. #1780

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Document tradeoffs between isInstanceOf and as/assertIs. #1780

JDK 8

JDK 8

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Document tradeoffs between `isInstanceOf` and `as`/`assertIs`. #1780