vec2i serialize/deserialize to single int

vec2i-serialize.ts

export type Vec2i = readonly [x: number, y: number];
export namespace Vec2i {
	export function serialize (...[x, y]: Vec2i) {
		let number = 0;
		let i = 0;
		while (x || y) {
			let val;
			if (i % 2) {
				val = y;
				y >>= 1;
			} else {
				val = x;
				x >>= 1;
			}
			number |= (val & 1) << i++;
		}

		return number;
	}

	export function deserialize (n: number): Vec2i {
		let x = 0;
		let y = 0;
		let i = 0;
		while (n) {
			const val = n & 1;
			n >>= 1;
			if (i % 2) {
				y |= val << (i >> 1);
			} else {
				x |= val << (i >> 1);
			}
			i++;
		}

		return [ x, y ];
	}
}