bug: buttons weirdness

[dragoncoder047]

kaplay({ buttons: { foo: { keyboard: ["q", "w"] } } });
onButtonDown("foo", () => debug.log("foo"));

1. press both q and w
2. release one of them, hold the other
3. the foo stops getting logged, even though you are holding a valid button binding down

[lajbel]

I mean, its how Set work, I think to fix it in 4000 will make it a Map, so when you release q, and hold w, it doesn't loose register.

Also what should happen between devices? mantain? no? Should be optionable?