Streamline bug: Function::apply(this, arguments) not handled

arguments_.js

// arguments_.js
// Tests Streamline's ability to handle `arguments` objects which contain a
// Streamline (underscore) callback parameter.

var THIS = 'context';
var COOKIE = 'cookie'

var innerHasExited = false;
var outerHasExited = false;

function inner(cookie, _) {
    if (this.toString() !== THIS) {
        console.log('FAIL: `this` was not properly preserved: ' + this);
    } else {
        console.log('PASS: `this` was properly preserved.')
    }

    setTimeout(_, 500);

    if (outerHasExited) {
        console.log('FAIL: inner exiting after outer.');
    } else {
        console.log('PASS: inner exiting before outer.');
    }

    innerHasExited = true;
    return cookie;
}

function outer(cookie, _) {
    if (this.toString() !== THIS) {
        console.log('FAIL: `this` was not properly preserved: ' + this);
    } else {
        console.log('PASS: `this` was properly preserved.')
    }

    // FAILS:
    var result = inner.apply(this, arguments);
    // PASSES:
    //var result = inner.call(this, cookie, _);

    if (!innerHasExited) {
        console.log('FAIL: outer exiting before inner.');
    } else {
        console.log('PASS: outer exiting after inner.');
    }

    outerHasExited = true;
    return result;
}

var context = {
    runTest: outer,
    toString: function () {
        return THIS;
    }
};

var future = context.runTest(COOKIE);
var result = future(_);

if (result !== COOKIE) {
    console.log('FAIL: argument was not properly passed: ' + result);
} else {
    console.log('PASS: argument was properly preserved.');
}