Capability granting the ability to terminate the isolate.
This capability is required by kill and setErrorsFatal. If the capability is null, or if it is not the correct termination capability of the isolate identified by controlPort, then calls to those methods will have no effect.
final Capability terminateCapability
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https://api.dart.dev/stable/2.5.0/dart-isolate/Isolate/terminateCapability.html