The v8 stack trace api is documented at
    https://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
For Avatar to be able to work with stack traces compatibly with node, nashorn should follow the v8 stack trace api convention as closely as possible.

depd [https://www.npmjs.org/package/depd] is a popular (more than half a million downloads/month) module that uses the v8 stack api to introspect the call stack. Recent versions of express [https://www.npmjs.org/package/express], a very popular module (1.3 million downloads/month, #6 most depended upon) depend upon depd. Express will not work on avatar.js unless depd's stack introspection is supported by nashorn, so this is a high priority for Avatar.