web.structured-clone test will always fail

[Pyrolistical]

core-js/tests/compat/tests.js

Line 1863 in bba906e

if (!(test && test.a === test.b && test.a instanceof Error && test.stack === error.stack)) return false;

The bug in the test

var error = new Error();
var test = structuredClone({ a: error, b: error });
if (!(... && test.stack === error.stack)) return false;

test.stack will always be undefined and error.stack will always be an array.

I think the test intended use test.a.stack? But I am not sure as it would seem that test.a === error would be a better test.

[Pyrolistical]

Like copypasta from

core-js/packages/core-js/modules/web.structured-clone.js

Line 72 in bba906e

return !(test && test.a === test.b && test.a instanceof $Error && test.stack === error.stack);

[Pyrolistical]

Ah according to this e41db12#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4edR4

I believe the intended code is test.a.stack === error.stack

[zloirock]

Yes, thanks, you are right, it's a typo. Anyway, no one of the current native implementations still does work as expected - FF implementation is the closest and left the final issue.