Sets whether uncaught errors will terminate the isolate.
If errors are fatal, any uncaught error will terminate the isolate event loop and shut down the isolate.
This call requires the terminateCapability for the isolate. If the capability is absent or incorrect, no change is made.
Since isolates run concurrently, it's possible for the receiving isolate to exit due to an error, before a request, using this method, has been received and processed. To avoid this, either use the corresponding parameter to the spawn function, or start the isolate paused, set errors non-fatal and then resume the isolate.
external void setErrorsFatal(bool errorsAreFatal);