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jasnell / proposal-istypes

TC-39 Proposal for additional is{Type} APIs
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`[Symbol.builtin]` and `global.Builtins` should be immutable #22

Closed pitaj closed 7 years ago

pitaj commented 7 years ago

The functions included in this proposal should be trustworthy no matter what, IMO. That means that no code should be able to change the [Symbol.builtin] property of an existing object.

I'd go as far as to say that other objects should not be able to claim they are built in, but that excludes the possibility of polyfilling.

ljharb commented 7 years ago

from https://github.com/jasnell/proposal-istypes/issues/18#issuecomment-305934922

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 commented 7 years ago

Closing as answered