const or let question

ConstOrLet.js

'use strict';

let toBeProp = 5;

const myObject = {};
Object.defineProperty(myObject, 'prop', {
	get () {
		return {
			[Symbol.toPrimitive] () {
				return toBeProp;
			}
		};
	},
	enumerable: true,
});

// const or let ???
const { prop: prop1 } = myObject;
let { prop: prop2 } = myObject;

console.log(prop1 + 0);			// 5
console.log(prop2 + 0);			// 5

toBeProp = 7;

console.log(prop1 + 0);			// 7
console.log(prop2 + 0);			// 7

prop2 = 3;

console.log(prop1 + 0);			// 7
console.log(prop2 + 0);			// 3

console.log(myObject.prop + 0);		// 7