window.Function.constructor should be equal overriden window.Function

[AlexanderMoskovkin]

page: http://todomvc.com/examples/humble
error: Uncaught Error: interface conversion: interface is map[string]interface {}, not func(...interface {}) *js.Object

reproduced in playground. Tested in Chrome but should be check in other browsers

[AlexanderMoskovkin]

I'm working on this

[AlexanderMoskovkin]

The problem appears because we override the window.Function object.
As a result the following script:

<script>
    var f = function () {
    };

    switch (f.constructor) {
        case Function:
            alert('OK');
            break;
        default:
            alert('FAIL');
    }
</script>

raises alert('OK') on the original page, but alert('FAIL') via playground.

As a workaround we can process a .constructor property and return an original Function object
/cc @churkin

[AlexanderMoskovkin]

It seems I've found a fix for this, I'll create a pull request tomorrow

[lock]

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