An exception emitted on buffer overflow, like when using OverflowStrategy.Fail.
A composite exception represents a list of exceptions that were caught while delaying errors in the processing of observables.
The MultipleSubscribersException happens for hot observables
that support a single subscriber.
A composite exception represents a list of exceptions that were caught while delaying errors in the processing of observables.
Used in operators such as
mergeDelayErrors,concatDelayError,combineLatestDelayError, etc...