context masks turns into negative value

[KFlash]

OptionsUniqueKeyInPattern = 1 << 31, is a negative value and can cause conflicts and unexpected things can happen :)

[3cp]

As long as we only do bitwise operations around those options, it could be fine?

[3cp]

https://github.com/meriyah/meriyah/search?q=OptionsUniqueKeyInPattern

Looks fine to me.

[KFlash]

It looks okay, but I guess it's value is something like '-242585759" ? I didn't check it, but in some cases NodeJS / browser can end up mixing together multiple context masks when this is the only one you want to use. So suddenly you are in strict mode and disallow in context while parsing in module goal etc.

[prantlf]

I hope that you're right that the current code is fine. Shouldn't the following check use === 0, so that we can sleep well? I suspect that as soon as somebody sets options.uniqueKeyInPattern the condition will accidentally return true...

if ((context & Context.SuperCall) < 1) report(parser, Errors.SuperNoConstructor);

[3cp]

It's possible to use bigint to store the option bits, it supports all bitwise operations.
The question is whether we want to take the performance hit (but I have not found any existing benchmark for bigint bitwise operations).