Critical Javascript evaluation order error

I think I found a critical bug in Qt's Javascript engine. Here's a minimal example that triggers it. It is quite self-explanatory:

function myFunc(arg) {
    console.log("myFunc invoked", arg);
};
let array = [myFunc, "string"];
array[0](array.reverse());

The code does actually invoke the function in browsers and in nodejs. But not in V4 where it gives "Type Error". Looks like V4 evaluates array[0] only after array.reverse() has been performed.

I stumbled on this behaviour while running obfuscated js code but I guess this could happen even in human-written code. IMO this bug should be top-priority.