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instanceof doesn't work

Hi !

I'm facing with a problem using instanceof on a global variable defined in the context parameter.
Here are examples of what it seems to be an issue.

var asyncEval = require('async-eval');

var options = {
    context: {
        input: [],
        output : undefined
    }
};
var code = 'output = [] instanceof Array';

asyncEval(code, options, logResult);

function logResult(){
    console.log("Result: ", options.context.output);
}

This snippet logs (as expected)

"Result: true"

var asyncEval = require('async-eval');

var options = {
    context: {
        input: [],
        output : undefined
    }
};
var code = 'output = input instanceof Array';

asyncEval(code, options, logResult);

function logResult(){
    console.log("Result: ", options.context.output);
}

This snippet logs (unexpected)

"Result: false"

var asyncEval = require('async-eval');

var options = {
    context: {
        input: [],
        output : undefined
    }
};
var code = 'output = input.constructor.name';

asyncEval(code, options, logResult);

function logResult(){
    console.log("Result: ", options.context.output);
}

This snippet logs

"Result: Array"

I don't understand why the eval is able to access to the constructor of the ìnput var but cannot evaluate it properly with the instanceof operator.

Thanks in advance !