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Separately bound keys are not firing together #43

Description

@se-panfilov

Describe the bug
If you are binding some keys separately, e.g.

const coords = { x: 0, y: 0 };

bindKey('w', () => coords.x += 1  );
bindKey('a', () => coords.y -= 1  );
bindKey('s', () => coords.x -= 1  );
bindKey('d', () => coords.y += 1  );

While pressing 2 keys (or more), only one of the callback is triggered. (But all should be triggered, imo)

Expected behavior
I expect both callbacks to be triggered at the same time, cause 2 buttons are still pressed.

Why
Imagine a videogame, e.g. a shooter game. User is moving using WASD alongside with "space" for a jump, "G" for throwing grenade and etc. It's literary impossible to bind every combo. Instead the binds should be independent from each other ("W" moves forward, "A" moves left, so eventually user will be moved forward and left) .

To Reproduce
An example at stackblitz:
https://stackblitz.com/edit/vitejs-vite-iunkan?file=src%2Fmain.ts

You can move the "Actor" red square using WASD, but cannot move it in a diagonal direction.

P.S. used version 1.5.6

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