Would `is` and `typeof` be *configurable* properties of `Builtins`?

[bengl]

I think there are scenarios in which there would be reasons to override/replace these functions.

[jasnell]

Yes, they would be configurable and enumerable.

[pitaj]

I disagree. I think these functions should be trustworthy in every circumstance.

[bengl]

@pitaj Compare with Reflect, where everything is configurable.

[ljharb]

@pitaj just like everything in JS, if your code runs first, you can get and hold a reference to it.

Almost everything must be configurable, for polyfills and security reasons. There are very few exceptions to that have a remote chance of getting through committee.

[jasnell]

Closing as answered :-)