Re: [heycam/webidl] Added a definition of {{StringContext}} extended attribute. (#841)

> the relevant global object realm of this (to check the CSP list),

OK.  Back with my implementor hat on, this is currently not readily available in the guts of type conversions in Gecko, fwiw...  With my spec hat on, it's sort of ambient state, kinda, if you know your type conversion is happening in the right places....

The CSP check doesn't need to know what method is involved?

> the IDL identifier name of the attribute / operation (string of it would be enough) - this is to put details into a CSP violation object,

Again, not really something that's available in the guts of type conversions right now, either in the spec or in (some) impls.  This one would be much more clearly available in the "option 2, before" scenario, of course, since that has access to the operation (in the spec).

Again, threading it through is possible, but needs to be done; definitely on the spec side.

> some identifier of the type to convert to (a string is fine),

This is the value of the extended attribute, so is conceptually available wherever we need it, assuming we can tell that we have the extended attribute at all at that point.

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