TypedArray.prototype.includes()

const uint8 = new Uint8Array([10, 20, 30, 40, 50]);

console.log(uint8.includes(20));
// : true

// Check from position 3
console.log(uint8.includes(20, 3));
// : false

includes(searchElement)
includes(searchElement, fromIndex)

const uint8 = new Uint8Array([1, 2, 3]);
uint8.includes(2); // true
uint8.includes(4); // false
uint8.includes(3, 3); // false

// NaN 
new Uint8Array([NaN]).includes(NaN); // false ( NaN  0 )
new Float32Array([NaN]).includes(NaN); // true