Re: [whatwg/webidl] Allow for global objects with a mutable prototype chain (PR #1381)

@annevk commented on this pull request.



> +A [=realm=] can be defined to
+<dfn export for="realm" lt="has a mutable global prototype chain">have a mutable global prototype chain</dfn>.
+If a [=realm=] is not defined as such, the prototype of its global object can not be changed.

I keep having to learn that conditional fields I have added in the past have led to some kind of issue that required changing them to always-present fields. I would suggest we make this an always-present field of realms with a default of false.

> Each realm has an associated "uses mutable global prototype chain" (a boolean). It is initially false.
>
> Note: This allows the ShadowRealm global to have a mutable prototype.

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