Realm for "package data"

[Ms2ger]

https://fetch.spec.whatwg.org/#body-mixin

package data

… creates a Blob without defining its global object.

[Ms2ger]

CC @bzbarsky @annevk @domenic

Assuming that the correct answer is "the global object of the Body object we're dealing with"

[annevk]

Yeah. As I mentioned elsewhere, IDL really needs to start to define how an object is allocated as an abstract operation and then we should force everyone to go through that whenever they allocate an object of sorts. And then perhaps some convenient functions around that. For instance: Allocate(realm, interfaceToAllocate); AllocateFromThis(this, interfaceToAllocate); AllocateFromCurrent(interfaceToAllocate).

[domenic]

I think we should stick with the plan in whatwg/webidl#135 as that will be least disruptive. It will only require people to specify the realm when they're doing something asynchronous (i.e. not the sync consequence of a method or constructor call). In that case maybe having a term like "allocate" is good, and then we'd say "allocate an object x using interface I in realm r". Otherwise people can say "allocate an object x using interface I" or any of their current imprecise phrasings.

[annevk]

If that's the plan I guess I don't technically need to change anything here, since we do have a this object.