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Description
Test:
<!DOCTYPE html>
<script>
sessionStorage.clear()
var a = new Proxy(Object.getPrototypeOf(sessionStorage), {
set(...args) { w(args); return false; },
});
Object.setPrototypeOf(sessionStorage, a);
sessionStorage.x = "foo";
w(sessionStorage.x)
</script>Gecko and Chrome call proto.[[Set]]() rather than taking the early return, as shown by the log:
log: object "[object Storage],x,foo,[object Storage]" (4 props: 0="[object Storage]", 1="x", 2="foo", 3="[object Storage]")
log: undefined
but WebKit may be following the spec:
log: foo
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