code: function _objectIs(a, b) {
    // SameValue algorithm
    if (a === b) { // Steps 1-5, 7-10
      // Steps 6.b-6.e: +0 != -0
      return a !== 0 || 1 / a === 1 / b;
    } else {
      // Step 6.a: NaN == NaN
      return a !== a && b !== b;
    }
  }
docs: Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is