deepStrictEqual not commutative by not accounting for non-enumerable properties

[nmalyschkin]

• Version:
  • 14.x (but probably also others)
• Platform:
  • all

What steps will reproduce the bug?

const { deepStrictEqual } = require("assert");

const a = {};
const b = {};

a.x = 1;

Object.defineProperties(b, {
  x: {
    value: 1,
    writable: true,
  },
  y: {
    value: 5,
    writable: true,
    enumerable: true,
    configurable: true,
  },
});

console.log({ a, b });
deepStrictEqual(a, b); // does not assert
deepStrictEqual(b, a); // does assert

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior?

I expect deepStrictEqual to be at least commutative. (Whether it should handle non-enumerable properties may be up for discussion)

What do you see instead?

deepStrictEqual(b, a) does throw an assertion while deepStrictEqual(a, b) does not.

Additional information

If you point me in the right direction I'm willing to fix it myself.