So in that case, what do you think should be recommended to people if you don't think they should keep their own local-global copy of the current isolate? Should I put a `Isolate* isolate = Isolate::GetCurrent();` in each function that requires it? All of these examples put an `isolate` value at the top of file and in this particular example we have two files that were trying to do it which leads to a linking error (hence the `extern` here).