vue-router not working properly when overriding Set's Symbol.iterator

[c44cc]

Version

4.1.6

Reproduction link

jsfiddle.net/rwujqztf/3/

Steps to reproduce

see https://jsfiddle.net/rwujqztf/3/

What is expected?

run

What is actually happening?

[Vue Router warn]: Unexpected error when starting the router: TypeError: effect2.run is not a function
at triggerEffect (reactivity.esm-bundler.js:400:20)
at triggerEffects (reactivity.esm-bundler.js:387:13)
at triggerRefValue (reactivity.esm-bundler.js:1003:13)
at set value [as value] (reactivity.esm-bundler.js:1048:13)
at finalizeNavigation (vue-router.mjs:3334:22)
at vue-router.mjs:3207:27