1951982 - FinalizationRegistry.register throws TypeError when using a Symbol as unregister token

Status: RESOLVED DUPLICATE of bug 1863140

(Core :: JavaScript: GC, defect)

Description

[Hans Schallmoser]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Steps to reproduce:

I tried using a Symbol as unregister token for FinalisationRegistry

Reproduction:

const registry = new FinalizationRegistry((held) => {
  console.log(held);
});

const token = Symbol();
let value = {};

registry.register(value,"Foo",token);

value = null;

Actual results:

TypeError: Invalid unregister token passed to FinalizationRegistry.register

Expected results:

After GC "Foo" is printed to the console. (I have verified this using {} instead of Symbol() and testing with V8)