Error in debug if platform is never initialized on main thread?

[dsherret]

It might be useful to error in debug if the platform is never initialized on the main thread. This will help prevent situations where someone initializes v8 on separate threads without doing it on the main thread once (as in my case dprint/dprint-plugin-prettier#74).

[bartlomieju]

I think it makes sense, the question is if we should just print a message, panic or use new_default_unprotected_platform in this case.

The code to check if we're on main thread is:

if thread::current().id() == thread::main().id() {
        println!("Currently on the main thread");
    }

@mmastrac do you have thoughts on this one?

[bartlomieju]

Related #217 - maybe we should always use "unprotected" platform with #[cfg(test)]?

[bartlomieju]

Appears this was addressed in ec8cbe2.