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jdk.nashorn.api.* is the only Nashorn specific API package (extension to javax.script). Anything else is considered to be Nashorn implementation detail
jdk8: https://docs.oracle.com/javase/8/docs/jdk/api/nashorn/index.html?jdk/nashorn/api/scripting/JSObjectpackage-summary.html
jdk9 http://download.java.net/jdk9/docs/jdk/api/nashorn/
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