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Why is Safari passing this Modernizr test I wrote for WebRTC?

I wanted a Modernizr test to check for setLocalDescription with description optional. Here is what I came up with:

window.Modernizr.addTest('paramlessrtclocaldescription', function () {
    try {
        return window.RTCPeerConnection.prototype.setLocalDescription.length === 0;
    } catch (err) {
        // This can only happen if the browser doesn't support RTCPeerConnection, and
        // we have a separate test for that, but we don't want this test to crash
        // the script.
        return false;
    }
});

When I run this test in Firefox 73 (on Windows, from PortableApps.com), it properly returns false.

However, when I run it in Safari 14.1, the test returns true, even though Safari does not support this function.

Furthermore, when I open the JS Console and type window.RTCPeerConnection.prototype.setLocalDescription.length, it returns 3 and window.RTCPeerConnection.prototype.setLocalDescription.length === 0 returns false.

Why is Safari passing the Modernizr test when manually running it in the console shows that it would have failed? How can I make it fail properly?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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