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JavaScript Extremely weird behavior of the "keyup" event handler. I don't understand anything.

Guys, I just don't get it. I don't see ANY logics here. Could you help me?

Code:
function it_makes_no_sense_whatsoever(event){
  console.log(event.keyCode);
  console.log(event.keyСode==37);
  console.log(event.keyСode===37);
  console.log(parseInt(event.keyСode)==37);
  console.log(parseInt(event.keyСode)===37);
}
document.addEventListener(`keyup`, it_makes_no_sense_whatsoever);
If I apply this code and then press the Left Arrow, the console prints the following:

37
false
false
false
false
But WHY?​
 
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